Johnson's Western Hemisphere [and] Johnson's Eastern Hemisphere. By Johnson and Ward.
MLA
Johnson's Western Hemisphere [and] Johnson's Eastern Hemisphere. By Johnson and Ward. 0AD. https://collections.library.yale.edu/catalog/15234630.
APA, 6th edition
Johnson's Western Hemisphere [and] Johnson's Eastern Hemisphere. By Johnson and Ward. (0 C.E.). [Maps]. https://collections.library.yale.edu/catalog/15234630.