Cite

H.O. and F.S. Dellenbaugh on the Powell Monument, Grand Canyon.

MLA

Kolb Bros, Kolb, and Emory. H.O. and F.S. Dellenbaugh on the Powell Monument, Grand Canyon. 1921. https://collections.library.yale.edu/catalog/2018274.

APA, 6th edition

Kolb Bros, K., & E. (1921). H.O. and F.S. Dellenbaugh on the Powell Monument, Grand Canyon. [Photographic prints, Photographs]. https://collections.library.yale.edu/catalog/2018274.