Stock Photo - Figure 9: A study of m. frontalis in maximum contraction, 1854–56, printed 1862, Albumen silver print from glass negative, Image (Oval): 28.4 × 20.3 cm (11 3/16 × 8 in.), Photographs, Guillaume-Benjamin-Amand Duchenne de Boulogne (French, 1806–1875), Adrien Tournachon (French, 1825–1903)

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