Cite

Bird's-eye map of the White Mountains, reached by Boston & Maine RR / R.A. Supply Co., eng'rs and printers.

MLA

Co, Rand Avery Supply. Bird's-Eye Map of the White Mountains, Reached by Boston & Maine RR / R.A. Supply Co., Eng'Rs and Printers. [R.A. Supply Co., 1902. https://collections.library.yale.edu/catalog/15827430.

APA, 6th edition

Co, R. A. S. (1902). Bird's-eye map of the White Mountains, reached by Boston & Maine RR / R.A. Supply Co., eng'rs and printers. [Aerial views]. [R.A. Supply Co., https://collections.library.yale.edu/catalog/15827430.