Cite

No. 34. Knife Blade or Needle Rock, Elk Canyon on the B. & M. railway

MLA

Locke, H. R. No. 34. Knife Blade or Needle Rock, Elk Canyon on the B. & M. Railway. 1892. https://collections.library.yale.edu/catalog/2011971.

APA, 6th edition

Locke, H. R. (1892). No. 34. Knife Blade or Needle Rock, Elk Canyon on the B. & M. railway [Card photographs, Photographic prints, Photographs]. https://collections.library.yale.edu/catalog/2011971.