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Commissioners and Directors of the U.P.R.R.
[Union Pacific Rail Road, Excursion to the 100th Meridian, October 1866]
Library of Congress, Prints and Photographs Division
Reproduction Number: LC-DIG-stereo-1s00080 (digital file from original photo, front) LC-USZ62-34588 (b&w film copy neg. of half stereo), Call Number: LOT 3037, no. 8 [item] [P&P]