Cite

U.S.P.R.R. Exp. & Surveys. 41st parallel. Expl. by Lieut. Beckwith. Vol.II. Portion of the Main Mountain passage of the Upper Sacramento or Pitt River

MLA

C. Schumman from F. W. Egloffstein, Selmar Siebert's Engraving, et al. U.S.P.R.R. Exp. & Surveys. 41st Parallel. Expl. by Lieut. Beckwith. Vol.II. Portion of the Main Mountain Passage of the Upper Sacramento or Pitt River. 0AD. https://collections.library.yale.edu/catalog/2015822.

APA, 6th edition

C. Schumman from F. W. Egloffstein, S. S. E., Printing Establishment, W., & D. C. (0 C.E.). U.S.P.R.R. Exp. & Surveys. 41st parallel. Expl. by Lieut. Beckwith. Vol.II. Portion of the Main Mountain passage of the Upper Sacramento or Pitt River [Intaglio prints]. https://collections.library.yale.edu/catalog/2015822.