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Dear Mr. Schuh,
Thank you for posting your request on History Hub!
It is possible that isometric charts are stored with the ship’s plan. Ship Engineering Drawings, ca. 1940 - ca. 1966 in the Records of the Bureau of Ships, 1940 - 1966 (Record Group 19) are in the custody of the National Archives at College Park - Catographic (RDSC). Please contact RDSC via email at email@example.com for a search of these records.
We hope this information is helpful. Best of luck with your research!