Europe.
MLA
Hammond, C. S., and Company. Europe. C.S. Hammond & Co., 0AD. https://collections.library.yale.edu/catalog/15826782.
APA, 6th edition
Hammond, C. S., & C. (0 C.E.). Europe. [Maps]. C.S. Hammond & Co., https://collections.library.yale.edu/catalog/15826782.