United States. National Archives and Records Service, Johnson, M. H., & Heynen, W. J. (1974). Inventory of the records of the Hydrographic Office, Record group 37. National Archives, National Archives and Records Service, General Services Administration.
Chicago Style (17th ed.) CitationUnited States. National Archives and Records Service, Maizie H. Johnson, and William J. Heynen. Inventory of the Records of the Hydrographic Office, Record Group 37. Washington: National Archives, National Archives and Records Service, General Services Administration, 1974.
MLA (8th ed.) CitationUnited States. National Archives and Records Service, et al. Inventory of the Records of the Hydrographic Office, Record Group 37. National Archives, National Archives and Records Service, General Services Administration, 1974.