Emma Homan Thayer, Violets, from Wild Flowers of the Pacific Coast, 1887 (Source: Wikimedia Commons)
Background
Oxford Art Online
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Oxford Art Online is an art reference library that searches Grove Art Online, The Oxford Companion to Western Art, The Concise Oxford Dictionary of Art Terms, and The Encyclopedia of Aesthetics. This resource contains images, biographies, subject entries, and thematic timelines (antiquity to present).
Image Sources
JSTOR Images (formerly Artstor)
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A digital library that provides access to thousands of digital images derived from a variety of museum, library and archival collections. Images support a variety of disciplines including architecture, painting, sculpture, photography, decorative arts, and design.
The Wellcome Library makes more than 40,000 images searchable online relating to medicine and social history. Note that the Advanced Search includes a year range option.