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Start Over You searched for: Author Hydrographic Office Remove constraint Author: Hydrographic Office Publish Year Decade 1940 - 1949 Remove constraint Publish Year Decade: 1940 - 1949 Sudoc Stem N 6.31 Remove constraint Sudoc Stem: N 6.31

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2. Memorandum for aviators 12; May 22, 1941.

5. Memorandum for aviators 5; Feb. 7, 1941.