Cite

Map of the Canal Zone and vicinity / compiled under the direction of O.E. Malsburgy, Section of Surveys.

MLA

Zone, Canal. Map of the Canal Zone and Vicinity / Compiled under the Direction of O.E. Malsburgy, Section of Surveys. Panama Canal, 0AD. https://collections.library.yale.edu/catalog/15822461.

APA, 6th edition

Zone, C. (0 C.E.). Map of the Canal Zone and vicinity / compiled under the direction of O.E. Malsburgy, Section of Surveys. [Maps]. Panama Canal, https://collections.library.yale.edu/catalog/15822461.