"Greater" Germany; population dependent upon agriculture (by kreise, 1939)
MLA
of Strategic Services. Research, United States. Office, and Analysis Branch. "Greater" Germany; Population Dependent upon Agriculture (by Kreise, 1939). R & A, OSS, 1945. https://collections.library.yale.edu/catalog/15479621.
APA, 6th edition
of Strategic Services. Research, U. S. O., & Branch, A. (1945). "Greater" Germany; population dependent upon agriculture (by kreise, 1939) [Maps]. R & A, OSS, https://collections.library.yale.edu/catalog/15479621.