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War Department Decimal File System

The United States War Department produced multiple editions of the War Department Decimal File System, beginning in January 1914. The department used the system to classify correspondence, decimal files, and other records.

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The U.S. National Archives and Records Administration
8601 Adelphi Road, College Park, MD 20740-6001
Telephone: 1-86-NARA-NARA or 1-866-272-6272