Cite

Asher & Adams' Idaho, Montana western portion.

MLA

Asher & Adams' Idaho, Montana Western Portion. Asher & Adams, 0AD. https://collections.library.yale.edu/catalog/15818324.

APA, 6th edition

Asher & Adams' Idaho, Montana western portion. (0 C.E.). [Maps]. Asher & Adams, https://collections.library.yale.edu/catalog/15818324.