Cite

Prussia [cartographic material] = Preussen.

MLA

Prussia [Cartographic Material] = Preussen. George Philip & Son, 0AD. https://collections.library.yale.edu/catalog/15482972.

APA, 6th edition

Prussia [cartographic material] = Preussen. (0 C.E.). [Maps]. George Philip & Son, https://collections.library.yale.edu/catalog/15482972.