John K. Hillers 1873 The little rapid, Pa-ru-no-wip [U.S. topographical and geological survey of the valley of the Colorado River of the west, by J.W. Powell and A.H. Thompson. No. 013]
Stereoview Library of Congress, Prints and Photographs Division Reproduction Number: LC-DIG-stereo-1s00776 digital file from original photo, front) LC-DIG-stereo-2s00776 digital file from original photo, back) LC-USZ62-92675 (b&w film copy neg. of full stereo)
