Cite

United States showing routes of principal explorers and early roads and highways [map] / from data prepared by Frank Bond ; by I. B. Berthrong.

MLA

Berthrong, I. P. United States Showing Routes of Principal Explorers and Early Roads and Highways [Map] / from Data Prepared by Frank Bond ; by I. B. Berthrong. Dept. of the Interior, General Land Office, 1908. https://collections.library.yale.edu/catalog/15827815.

APA, 6th edition

Berthrong, I. P. (1908). United States showing routes of principal explorers and early roads and highways [map] / from data prepared by Frank Bond ; by I. B. Berthrong. [Maps]. Dept. of the Interior, General Land Office, https://collections.library.yale.edu/catalog/15827815.