Cite

Zones of intensive urban land use in the Ruhr [cartographic material] / compiled and drawn in the Branch of Research and Analysis, OSS.

MLA

of Strategic Services. Research, United States. Office, and Analysis Branch. Zones of Intensive Urban Land Use in the Ruhr [Cartographic Material] / Compiled and Drawn in the Branch of Research and Analysis, OSS. Reproduction Branch, OSS, 1943. https://collections.library.yale.edu/catalog/15483116.

APA, 6th edition

of Strategic Services. Research, U. S. O., & Branch, A. (1943). Zones of intensive urban land use in the Ruhr [cartographic material] / compiled and drawn in the Branch of Research and Analysis, OSS. [Maps]. Reproduction Branch, OSS, https://collections.library.yale.edu/catalog/15483116.