| Frederick Gutekunst Dumb-Bell Charts in Background (Group at Pennsylvania Training School for Feeble-Minded Children) 1858 (ca) Salt print 4 15/16 x 3 7/16 ins (12.54 x 8.73 cm) (image) Nelson-Atkins Museum of Art Gift of Hallmark Cards, Inc., Object number: 2005.27.531 LL/81720
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