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National Geographic Society (U.S.). Cartographic Division. Central Europe and the Mediterranean as of August 28, 1939: compiled and drawn in the Cartographic Section of the National Geographic Society for the National Geographic Magazine, Gilbert Grosvenor, editor. [TIFF]. Washington, D.C. : National Geographic Society, 1939.. Retrieved from https://geo.nyu.edu/catalog/princeton-3x816q83h