| Underwood & Underwood Children in geography class viewing stereoscopic photographs 1908 (ca) Stereocard Library of Congress, Prints and Photographs Division Reproduction Number: LC-DIG-stereo-1s04757 (digital file from original item) LC-USZ62-90216 (b&w film copy neg.), Call Number: LOT 8588 [item] [P&P] LL/65210
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