Cite

Harper's War map of France [cartographic material].

MLA

Harper's War Map of France [Cartographic Material]. Harper & Brothers], 1870. https://collections.library.yale.edu/catalog/15483878.

APA, 6th edition

Harper's War map of France [cartographic material]. (1870). [Maps]. Harper & Brothers], https://collections.library.yale.edu/catalog/15483878.