Cite

Camp de Lassigny, Anciennes Organisations Francaises et Allemandes [cartographic material] / Engraved and printed by the U.S. Geological Survey.

MLA

Geological Survey (U.S.). Camp de Lassigny, Anciennes Organisations Francaises et Allemandes [cartographic material] / Engraved and printed by the U.S. Geological Survey.. BRBL_00173. 1917?]. https://collections.library.yale.edu/catalog/15826964.

APA, 6th edition

Geological Survey (U.S.). (["BRBL_00173"])(1917?])[Camp de Lassigny, Anciennes Organisations Francaises et Allemandes [cartographic material] / Engraved and printed by the U.S. Geological Survey.]. https://collections.library.yale.edu/catalog/15826964.