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Rawpixel, Pikwizard, Foter, Barnimages, Creative Commons, Kaboompics, Life of Pix, Public Domain Archive, Stockvault and other free stock image resources.
Whitney Museum of American Art, The Metropolitan Museum of Art, Tate Modern, The Museum of Modern Art, Museum of the City of NY and other art resources.
The Art of Foto, Europeana Collections, Lens Culture, 500 Photographers, Minor White Archive, The Eye of Photography and other photography resources.