Cite

Reconnaissance map of a portion of the Rocky Mountains between latitudes 49° & 51°30' / geologically colored by George M. Dawson ; compiled and drawn by L.N. Richard, A.E. Barlow and James White.

MLA

Dawson, George M. 1849-1901. Reconnaissance map of a portion of the Rocky Mountains between latitudes 49° & 51°30' / geologically colored by George M. Dawson ; compiled and drawn by L.N. Richard, A.E. Barlow and James White.. BRBL_00391. 1886. https://collections.library.yale.edu/catalog/15536334.

APA, 6th edition

Dawson, George M. 1849-1901. (["BRBL_00391"])(1886)[Reconnaissance map of a portion of the Rocky Mountains between latitudes 49° & 51°30' / geologically colored by George M. Dawson ; compiled and drawn by L.N. Richard, A.E. Barlow and James White.]. https://collections.library.yale.edu/catalog/15536334.