Cite

Europe and the Near East, Russian and Polish boundaries according to treaties and claims as of April 1, 1949.

MLA

National Geographic Society (U.S.). Europe and the Near East, Russian and Polish boundaries according to treaties and claims as of April 1, 1949.. BRBL_00032B. 1949. https://collections.library.yale.edu/catalog/15258804.

APA, 6th edition

National Geographic Society (U.S.). (["BRBL_00032B"])(1949)[Europe and the Near East, Russian and Polish boundaries according to treaties and claims as of April 1, 1949.]. https://collections.library.yale.edu/catalog/15258804.