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Alfred Hart
Summit tunnel, before completion. Western summit, altitude 7,042 feet
[Central Pacific Railroad, California. Scenes in the Sierra Nevada Mountains. No. 197]
1865-1869
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)
LL/109014
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LuminousLint 
@LuminousLint