By Sonora Wallace
Julie de Graag (Dutch, 1877–1924)
Nikolai Ivanovich Vavilov (Russian, 1887–1943)
Camille Pissarro (French, 1830-1903)
Gustave Caillebotte (French, 1848-1894)
Konstantin Ivanovich Gorbatov (Russian, 1876 - 1945)
Samuel Prout (English, 1783-1852)