ARTstor 

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Users must create a free account (or link an existing JSTOR account) for access and to download images.
ArtStor is migrating to the JSTOR platform. The ArtStor platform will be retired on August 1, 2024. Images are already available on
JSTOR and additional functionality is coming.
A digital library of nearly one million images in the areas of art, architecture, the humanities, and social sciences for research and pedagogical purposes.