Alfred Hart 1865-1869 Summit tunnel, before completion. Western summit, altitude 7,042 feet [Central Pacific Railroad, California. Scenes in the Sierra Nevada Mountains. No. 197]
Stereoview Library of Congress, Prints and Photographs Division Reproduction Number: LC-DIG-stereo-1s00546 (digital file from original photo, front) LC-DIG-stereo-2s00546 (digital file from original photo, back) LC-USZ62-56960 (b&w film copy neg. of full stereo)
