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"NYPL Digital Gallery provides free and open access to over 800,000 images digitized from the The New York Public Library's vast collections, including illuminated manuscripts, historical maps, vintage posters, rare prints, photographs and more."
The Smithsonian Freer and Sackler galleries have digitized more than 40,000 images from their collections of Asian art, most of which are available in high-resolution and free of copyright restrictions for noncommercial use.