Images in our slide shows
Courtesy of the following institutes:

"Archery Contest", Chinese Qing Dynasty, 19th c., The National Gallery of Art Open Access program.
"Frederick Douglass, American, 1818 - 1895", Collection of the Smithsonian National Museum of African American History and Culture, Gift of Joele and Fred Michaud c. 1879
NGA Images (the National Gallery of Art): Albert Bierstadt, "Lake Lucerne", 1858; "American 19th Century: Trenton Falls, New York, c. 1870" (Horace W. Goldsmith Foundation); Edgar Degas, "The Dance Lesson", c. 1879 (Collection of Mr. and Mrs. Paul Mellon); Luca Signorelli, "The Marriage of the Virgin", c. 1490/1491 (Samuel H. Kress Collection);
The Metropolitan Museum of Art, Open Access Program-Creative Commons Zero: John Singer Sargent, "Tommies Bathing", 1918; Paul Klee, "Winter Journey", 1921; Tsukioka Kōgyo, Illustration of Noh Dance Scene, ca. 1910; Alfred Stieglitz, "Georgia O'Keeffe—Hands and Horse Skull", 1931; Paul Klee, "Southern Gardens", 1919; Paul Klee, "Temple Gardens", 1920; Suzanne Valadon, "Standing Nude", 1902 (Robert Lehman Collection); Robert S. Duncanson, Landscape with Rainbow, 1859, oil on canvas, Smithsonian American Art Museum, Gift of Leonard and Paula Granoff, 1983.95.160. Courtesy of Creative Commons.
As well as ASA-meetings.