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2 Agassiz, Jean Louis Rodolphe, 1807-1873 Scientist James Wallace Black, 1825-1896, and Perez M. Batchelder, ? - ? Photograph, albumen silver print, 6.3 x 5 cm. (2 1/2 x 1 15/16 in.), c. 1860 NPG.79.51 $35 Agassiz, Jean Louis Rodolphe, 1807-1873 Scientist Antoine Sonrel, ? - 1879 Photograph, albumen silver print, 9 x 5.3 cm. (3 1/2 x 2 1/8 in.), c. 1863 NPG.79.52 $25 Agassiz, Jean Louis Rodolphe, 1807-1873 Scientist John A. Whipple, 1822-1891 Photograph, albumen silver print, 9.4 x 5.8 cm. (3 11/16 x 2 5/16 in.), c. 1860 NPG.79.50 $25 Astor, Nancy Witcher Langhorne, Viscountess, 1879-1964 Social and political leader Walter Tittle, 1883-1968 Drawing, pencil on paper, 34.4 x 18.2 cm. (13 9/16 x 7 3/16 in.), 1922 NPG.79.99 $150 Astor, Nancy Witcher Langhorne, Viscountess, 1879-1964 Social and political leader Walter Tittle, 1883-1968 Drypoint, 28.5 x 19.2 cm. (11 1/4 x 7 9/16 in.), 1922 NPG.79.98 $100