Image:1477.jpg|Anonymous, Honorary membership certificate for Nicholas Biddle in “The Horticultural Association of the Valley of the Hudson” [detail], June 1839.
Image:1103.jpg|W. Mason, "Pennsylvania Hospital for the Insane," c. 1841, in Thomas S. Kirkbride, ''Reports of the Pennsylvania Hospital for the Insane: with a sketch of its history, buildings, and organization'' (1851), frontispiece.
Image:0110.jpg|c. 1847
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