Cite

Map of the Dragoman Pass, GSGS 2922.

MLA

Section, Great Britain. General Staff. Geographical. Map of the Dragoman Pass, GSGS 2922. War Office, GSGS, 1919. https://collections.library.yale.edu/catalog/15238046.

APA, 6th edition

Section, G. B. G. S. G. (1919). Map of the Dragoman Pass, GSGS 2922. [Maps]. War Office, GSGS, https://collections.library.yale.edu/catalog/15238046.