| Osborn & Durbec Ruins of Fort Sumter, Charleston Harbor, S.C. 1861, April Stereocard Library of Congress, Prints and Photographs Division Reproduction Number: LC-DIG-stereo-1s02596 (digital file from original stereograph, front) LC-DIG-stereo-2s02596 (digital file from original stereograph, back) LC-USZ62-55302 (b&w film copy neg. of half stereo) LC-USZ62-106831 (b&w film copy neg. of full stereo), Call Number: LOT 4166-C, no. 219 [P&P] LL/59453
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