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The directors of the U.P.R.R. at the 100th Mer.
[Union Pacific Rail Road, Excursion to the 100th Meridian, October 1866]
Library of Congress, Prints and Photographs Division
Reproduction Number: LC-DIG-stereo-1s00083 (digital file from original photo, front) LC-USZ62-5447 (b&w film copy neg. of half stereo), Call Number: LOT 3037, no. 11 [item] [P&P]