Google Scholar allows you to search for scholarly material, mostly periodical articles from sources that may be free to access, or may not.
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The following museums have large East Asian art collections as well as considerable online content and exhibits that reflect the museum's holdings.
Art of Asia Collection at the Museum of Fine Arts, Boston
Asian Art at the Art Institute of Chicago
Crow Collection of Asian Art in Dallas
Freer and Sackler Museum of Asian Art at the Smithsonian
Minneapolis Institute of Arts Asian Art Collections
San Antonio Museum of Art Asian Collection
Heaven and Earth Glowing Red (detail), 1964. Fu Baoshi (Chinese, 1904-1965) Courtesy of the Cleveland Museum of Art
The following are links to various East Asian art projects and resources online.
Getty Conservation Institute Wall Paintings at Mogao Grottoes project
Heilbrunn Timeline of Art History at the Metropolitan Museum of Art - East Asia
International Dunhuang Project: The Silk Road Online