Evidence
10 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-10).
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[1]DANFS, Humboldt (AVP-21), Naval History Division - verbatim HyperWar/ibiblio transcription (live NHHC page returned HTTP 404 on 2026-09-20 for humboldt, humboldt-avp-21, and uss-humboldt URL forms) [nhhc_danfs]
- Locator
- DANFS entry, specification line through disposition paragraph
- Finding type
- vessel_history
- Finding
- DANFS establishes the hull's identity and service: Humboldt (AVP-21), Barnegat class, named for the bay on the northern California coast; launched by Boston Navy Yard 1941-03-17 (sponsor Mrs. William T. Tarrant); commissioned 1941-10-07, Comdr. W. G. Tomkinson. Shakedown off the Atlantic coast; sailed Norfolk 1942-05-13 for Rear Admiral Ingram's South Atlantic Force, arriving Recife 1942-08-05 via San Juan and Trinidad to tend VP-83 patrol aircraft; supplied and repaired seaplanes, ferried aviation gasoline to outlying Brazilian air bases, and conducted antisubmarine patrol herself. On 1943-01-28 at Natal she hosted the conference between President Roosevelt (returning from Casablanca) and President Vargas of Brazil; established a new seaplane base at Aratu May 1943. Headed north 1943-07-01, arriving Boston 1943-07-17; sailed 1943-08-23 to carry supplies and parts to Fleet Air Wings in Newfoundland, Iceland, and Britain - often unescorted - into early 1944, with voyages to Casablanca. At Casablanca late May 1944 she went out to aid survivors of the torpedoed escort carrier Block Island and destroyer Barr and escorted Barr to safety; then carried an experienced submarine officer to rendezvous with Guadalcanal's hunter-killer group, which had captured U-505 on 4 June. Supply runs to Azores/North Africa squadrons until departing Norfolk 1945-03-22 for Brazil; Recife 1945-04-05, on station until Germany's surrender; sailed for Norfolk 1945-06-10. Moved to Philadelphia Navy Yard 1945-07-16 for conversion to a Press Ship; reclassified AG-121 1945-07-30 to serve as a broadcast and teletype center for correspondents in the final phase of the war against Japan - the war ended before conversion was completed. Arrived Orange, Texas 1945-11-22; decommissioned 1947-03-19 into the Atlantic Reserve Fleet; loaned to the Coast Guard January 1949, serving at Boston as a weather ship designated WHEC-372 (entry written during USCG service).
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-09-20
- Study period
- 1940-1949 (entry currency)
- Population
- Crew (~367 per DANFS spec line; 254 per Shipscribe 1944); presidents and staffs during the 1943-01-28 Natal conference; Navy-yard workers at Boston (construction 1940-41; availability Jul-Aug 1943) and Philadelphia (press-ship conversion Jul-Aug 1945); inactivation crew at Orange TX
- Limitations
- Authoritative naval-history narrative for this hull; contains no asbestos, insulation-material, or hazmat content - supports identity, yard periods, and service timeline only, no asbestos claim. Live NHHC page unreachable (404); verbatim transcription mirror cited per batch-01 link-rot convention. Entry ends during USCG service ('now serves at Boston as a weather ship, designated WHEC-372'), so it predates the 1969 return and 1970 disposal.
- Atlas source
- true
- Evidence ID
- ev-uss-humboldt-ag121-01
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[2]Shipscribe (Stephen S. Roberts), U.S. Navy Auxiliary Ships class file, BARNEGAT (AVP-10) page - compiled from official Navy records (construction/disposition tables, CNO correspondence summaries, class design notes) [other_primary]
- Locator
- Class header (design/machinery/armament), Construction table row AVP-21, Disposition table row AVP-21, ship notes para. 21, class narrative press-ship paragraph
- Finding type
- historical_record
- Finding
- Shipscribe's compiled official data for class BARNEGAT (AVP-10) establishes: Navy AVP-10 design; displacement 1,766 light / 2,800 lim.; 311.7'oa x 41.1'e x 13.5'lim (lengths recorded as 311.5 for AVP 21-22); Fairbanks-Morse diesels, 2 screws, 6,080 hp, 18.2 kts; complement 254 (1944). Construction table for AVP-21: ordered 1940-06-12, builder NYd Boston, keel 1940-09-06, launched 1941-03-17, commissioned 1941-10-07. Disposition table: decommissioned 1947-03-19; strike column 1966-09-26 (the permanent USCG transfer date applied to all 18 loaned AVPs); disposal 1949-01-24 to USCG; fate USCG. Ship notes: 'In USN reserve 1946-49. To AG-121 30 Jul 45 (Press Ship, OPI No. 2, conversion begun at Philadelphia Navy Yard, cancelled 16 Aug 45 and reconverted), to AVP-21 10 Sep 45. To USCG as HUMBOLDT (WAVP-372). Sold 22 May 70.' Class narrative: three ships (AVP 21, 22, and one other) designated July 1945 for urgent conversion to press ships (AG 121-23) for the invasion of Japan - deckhouse on the boat deck aft of the stack plus facilities for voice transmission, radio teletype, and radio telephoto; need evaporated with Japan's surrender and they were reconverted to AVPs. Armament table places AVP-21 in the 3x5"/38 + 40mm class fit for 1943-44 (and later reduced fits 1944-51).
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-09-20
- Study period
- 1938-1970 (class file coverage)
- Population
- Crew; Boston Navy Yard construction workers 1940-41; Philadelphia Navy Yard conversion workers Jul-Aug 1945
- Limitations
- Secondary compilation of official U.S. Navy auxiliary records (not the underlying documents themselves); class-narrative text says 'AVP 21, 22, and 27' for the AG 121-23 conversions but the file's own ship notes assign AG-123 to Rockaway (AVP-29) - '27' treated as a typo (see correction row). Strike column 1966-09-26 reflects permanent transfer, not the 1970 post-return striking NavSource records. Contains no asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-humboldt-ag121-02
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[3]NHHC, Dictionary of American Naval Aviation Squadrons Vol. 2 (Roy A. Grossnick), Appendix 5 Seaplane Tender Listings and VP/VPB squadron chapters - official NHHC publication (afhso.af.mil digitization via archive.org; live content/dam PDF returned HTTP 404 on 2026-09-20) [nhhc_danfs]
- Locator
- Appendix 5 tender listing table row for hull 21; chapter text for VP-74 (Dec 1942 Natal), NAF Belem facility history (VP-94), VPB-211 (Apr 1945)
- Finding type
- historical_record
- Finding
- NHHC's Dictionary of American Naval Aviation Squadrons Vol. 2 (Grossnick), Appendix 5 'Seaplane Tender Listings' (p. 731ff), lists hull 21 Humboldt with commission/decommission dates 7 Oct 1941 / 19 Mar 1947, other designations 'AG 121 30 Jul 1945' and 'AVP 21 10 Sep 1945', and disposition 'Transferred to USCG 24 Jan 1949' - an official NHHC publication confirming the AG-121 window, the reversion date, and the 19 March decommissioning. Chapter text independently documents Humboldt's tender service: VP-74 received tender service from Humboldt on arrival at NAF Natal in December 1942; Humboldt (followed by Barnegat AVP-10) provided support for VP-94 at NAF Belem until shore facilities were completed; and VPB-211 was based aboard Humboldt in April 1945.
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-09-20
- Study period
- 1941-1949
- Population
- Crew and hosted squadrons (VP-74 Dec 1942, VP-94 at Belem, VPB-211 Apr 1945)
- Limitations
- Official NHHC reference work; verifies designation and squadron-service dates for this hull. Table is OCR-fragmented in the digitization but the Humboldt row values are unambiguous and cross-confirmed by DANFS and Shipscribe. Contains no asbestos or material content.
- Atlas source
- true
- Evidence ID
- ev-uss-humboldt-ag121-03
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[4]NavSource Online Service Ship Photo Archive, USS Humboldt (AVP-21)/USCGC Humboldt (WAVP-372/WHEC-372) page 09/43/4321 - transcription of ship data, captured via search-index snippets [other_primary]
- Locator
- Page chronology block, awards block, specifications block (via search-index snippets; direct fetch failed)
- Finding type
- vessel_history
- Finding
- NavSource's Humboldt page (captured via search-index snippets; direct fetch blocked) records: laid down 1940-09-06 at Boston Navy Yard; launched 1941-03-17; commissioned 1941-10-07, 'CDR. William G. Tomlinson'; WWII service principally American Theater/South Atlantic; redesignated Miscellaneous Auxiliary (press ship) AG-121 1945-07-30; conversion canceled 1945-08-25; reverted to AVP-21; decommissioned 1947-03-17 (conflicts with the 03-19 of DANFS/Shipscribe/DANAS); Atlantic Reserve Fleet; loaned to USCG 1949-01-24; commissioned USCGC Humboldt (WAVP-372) 1949-03-29; redesignated high endurance cutter WHEC-372 1966-05-01; decommissioned 1969-09-30 and returned to US Naval custody; struck from the Naval Register 1970; final disposition scrapped in Italy. Awards list: American Defense Service Medal (Fleet clasp), American Campaign Medal, EAME Campaign Medal, WWII Victory Medal, National Defense Service Medal. Radio call sign NEJL.
- Verification
- partial
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-09-20
- Study period
- 1940-1970
- Population
- Navy crew 1941-47; USCG crew 1949-69
- Limitations
- Volunteer transcription site - used for chronology/awards corroboration, not as sole source for contested dates; its 1947-03-17 decommissioning and 1945-08-25 cancellation dates conflict with DANFS/Shipscribe/DANAS (see correction row). Direct fetch failed repeatedly in this session; content captured via search-index snippets, so the page was not read in full. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-humboldt-ag121-04
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[5]Documented plant and yard-period record: Shipscribe Barnegat class file (machinery, construction, ship notes, armament fits) + DANFS service narrative (Boston and Philadelphia yard periods, Orange inactivation); inference framed per house convention against era sources (ev-06, ev-07) [other_primary]
- Locator
- Shipscribe class header machinery line and ship notes para. 21; DANFS yard-period dates
- Finding type
- asbestos_application
- Finding
- Humboldt's documented plant and work history define the era-consistent asbestos inference space for this hull: a Navy-built diesel-driven seaplane tender (Fairbanks-Morse diesels, 2 screws, 6,080 hp - no boilers or steam turbines) constructed at Boston Navy Yard 1940-09-06 to 1941-10-07; a documented Boston Navy Yard period 1943-07-17 to 1943-08-23 (DANFS) coinciding with her move to the class's 3x5"/38 + 40mm armament fit listed for 1943-44 (Shipscribe); a press-ship conversion begun at Philadelphia Navy Yard 1945-07-16 and cancelled/reconverted August 1945 (Shipscribe: cancelled 16 Aug; NavSource: 25 Aug); inactivation at Orange TX from 1945-11-22; and Coast Guard weather-ship conversion before commissioning as WAVP-372 1949-03-29 (balloon shelter, oceanographic and hydrographic winches per class-wide USCG description). For a 1940-41 diesel Navy hull the era-consistent asbestos applications are engine exhaust and muffler lagging, gaskets and packing in machinery and piping joints, electrical insulation, joiner/bulkhead fireproofing, and deck coverings - not boiler or steam-turbine insulation, which this plant did not carry.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-09-20
- Study period
- 1940-1970
- Population
- Navy crew (~254-367); Boston Navy Yard workers (build 1940-41; 1943 availability); Philadelphia Navy Yard workers (Jul-Aug 1945 conversion/reconversion); USCG yard and crew 1949-69
- Limitations
- Era/design inference only - no ship-specific insulation schedule, survey, or material list was located for this hull or for the Barnegat class. The documented facts are the diesel plant and the dated yard/conversion periods; the asbestos content of any material aboard is unestablished. The diesel plant materially narrows the inference versus steam auxiliaries - no boiler or turbine insulation claim is made.
- Atlas source
- true
- Evidence ID
- ev-uss-humboldt-ag121-05
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[6]Corn, Jacqueline Karnell, and Jennifer Starr, 'Historical perspective on asbestos: Policies and protective measures in World War II shipbuilding,' American Journal of Industrial Medicine 11(3):359-373 [other_primary]
- Locator
- Article abstract and era summary
- Finding type
- asbestos_application
- Finding
- Peer-reviewed historical study documents that asbestos was used extensively as a fireproofing and insulating material in U.S. shipbuilding during WWII, and that wartime demand drove unprecedented asbestos utilization aboard Navy hulls - the era covering this hull's 1940-41 Boston Navy Yard construction, her 1943 Boston availability, and her 1945 Philadelphia Navy Yard conversion work.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-09-20
- Study period
- 1939-1945 (study scope)
- Population
- Shipyard workers and crews of WWII-era U.S. Navy construction generally
- Limitations
- Program/era-level scholarly documentation of asbestos use in WWII shipbuilding generally; does not name this vessel and does not establish that asbestos was or was not aboard this hull, nor quantity, location, condition, exposure, or causation.
- Atlas source
- true
- Evidence ID
- ev-uss-humboldt-ag121-06
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[7]GAO, Navy Efforts To Protect Workers From Asbestos Exposure, HRD-80-2 (Oct 18, 1979) [gao]
- Locator
- GAO product page description (full text returned HTTP 403 to automated fetch - standing defect from batch-01)
- Finding type
- gov_survey
- Finding
- GAO documented the Navy's asbestos-protection program and its insulation-removal policies - program-level confirmation that asbestos insulation was standard aboard Navy vessels of this ship's construction era and that the material later required managed removal. Humboldt's construction (1940-41), Navy service (1941-47), and Coast Guard conversion (1949) all fall within the pre-policy period GAO describes, in which insulation work was routine and largely uncontrolled.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-09-20
- Study period
- 1930s-1979 (report scope)
- Population
- Navy shipyard and aboard-ship insulation workers, program-wide
- Limitations
- Yard/program-level documentation, not hull-specific; establishes the era's asbestos-insulation baseline for Navy-built vessels, not conditions aboard Humboldt. Does not establish what was installed, removed, or retained on this hull. Full text not retrieved (gao.gov 403); description-level reliance only.
- Atlas source
- true
- Evidence ID
- ev-uss-humboldt-ag121-07
-
[8]Batch-625 search ledger (this record): DANFS/HyperWar transcription; NHHC DANAS Vol. 2 App. 5; Shipscribe AVP-10 file; NavSource (index snippets); USCG cutter index; CourtListener API (throttled) + web-index litigation screen [other_primary]
- Locator
- search_ledger sl-01 through sl-11
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, or docketed case naming USS Humboldt (AVP-21/AG-121) or USCGC Humboldt (WAVP/WHEC-372) was found in the public sources searched. The CourtListener API was throttled at query time (HTTP 429, 125/day cap exceeded, ~13.4-hour backoff), so litigation screening ran via web index: hits were name collisions only - Humboldt Baykeeper environmental litigation (CWA, Balloon Track/Humboldt Bay), Humboldt Waste Management Authority, and Hunters Point Naval Shipyard Tetra Tech remediation cases - plus law-firm marketing ship-lists that enumerate AVP-21 in generic Navy-ship lists, which are not evidence. No ship-specific asbestos documentation exists in DANFS, the NHHC DANAS volume, Shipscribe, or NavSource content reviewed.
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-09-20
- Study period
- 1940-present (public record)
- Limitations
- Absence of a located public record does not prove absence of asbestos aboard - a 1940-41 Navy-built auxiliary with multiple Navy-yard work periods is era-consistent with asbestos-containing materials. The litigation screen is weaker than the standard CourtListener API query (throttled); a direct query remains an open lead. No NARA retrieval was performed.
- Atlas source
- true
- Evidence ID
- ev-uss-humboldt-ag121-08
-
[9]NARA Guide to Federal Records: RG 24 (Bureau of Naval Personnel - ship deck logs), RG 19 (Bureau of Ships); USCG Historian's Office cutter file series (HUMBOLDT 1949-USCG, WAVP-372/WHEC-372) [other_primary]
- Locator
- NARA record-group guides; USCG cutter index (2008 Wayback capture)
- Finding type
- historical_record
- Finding
- Archival leads (not retrieved - research-room or reproduction order required; no spend authorized): NARA RG 24 deck logs for AVP-21/AG-121 (1941-1947) including the July-August 1945 Philadelphia conversion period and the 1943-01-28 Natal conference dates; RG 19 Bureau of Ships records of the Boston Navy Yard construction (1940-41), the 1943 Boston availability, and the Philadelphia Navy Yard press-ship conversion (OPI No. 2) and reconversion work orders, which may carry material/work specifications; USCG records for the 1949 weather-ship conversion (balloon shelter, oceanographic/hydrographic winches) and WAVP/WHEC-372 cutter files - the USCG Historian's Humboldt cutter file exists (confirmed in the official cutter index) but history.uscg.mil blocked automated fetch and Wayback was offline during this session.
- Verification
- unverified
- Role
- archival_lead
- Documentation level
- context_only
- Accessed
- 2026-09-20
- Study period
- 1940-1970
- Limitations
- Record-group mapping only - no box-level retrieval performed; existence of asbestos-specific documents for this hull is unknown until surveyed in person. Nothing in this row is an asbestos finding.
- Atlas source
- true
- Evidence ID
- ev-uss-humboldt-ag121-09
-
[10]Shipscribe AVP-10 file (construction/disposition tables, ship notes, class narrative); DANFS Humboldt (HyperWar transcription); NHHC DANAS Vol. 2 App. 5; NavSource AVP-21 page (via index snippets); uboat.net warship entry (secondary, corroborating 17 Mar only) [other_primary]
- Locator
- Shipscribe disposition table and ship notes para. 21; DANFS disposition paragraph; NavSource chronology block
- Finding type
- historical_record
- Finding
- Source discrepancies recorded for this hull: (a) decommissioning date - DANFS, Shipscribe, and NHHC DANAS Vol. 2 App. 5 give 1947-03-19; NavSource and uboat.net give 1947-03-17; 19 March adopted (three sources incl. two official), formally unresolved. (b) Press-ship conversion cancellation - Shipscribe ship notes give cancelled 1945-08-16; NavSource gives conversion canceled 1945-08-25; reversion to AVP-21 on 1945-09-10 (Shipscribe and DANAS agree). (c) Struck date - Shipscribe's disposition table carries 1966-09-26 (the permanent USCG transfer date applied to all 18 loaned AVPs); NavSource gives struck from the Naval Register 1970 after USCG return 1969-09-30; treated as transfer-vs-final-striking distinction. (d) CO name - DANFS 'Comdr. W. G. Tomkinson' vs NavSource 'CDR. William G. Tomlinson'. (e) Complement - DANFS 367 vs Shipscribe 254 (1944); kept separate. (f) Shipscribe class narrative 'AVP 21, 22, and 27' vs its own ship notes assigning AG-123 to Rockaway AVP-29 - class-text typo. (g) Upstream hull-list entry 'USS Hunboldt (AVP-21)' verified as a misspelling of this same hull and consolidated here; AVP-21 is a unique hull number and no second Humboldt/Hunboldt hull exists in Navy records.
- Verification
- verified
- Role
- correction
- Documentation level
- ship_specific
- Accessed
- 2026-09-20
- Study period
- 1940-1970
- Limitations
- Resolves publication-level discrepancies among authoritative and compiled sources; none affects identity, the AG-121 window, or the asbestos posture materially. Decommissioning and cancellation dates remain formally unresolved pending a primary deck log or BuShips record. No asbestos content in any discrepancy.
- Atlas source
- true
- Evidence ID
- ev-uss-humboldt-ag121-10