Oxford Art Online (OUP)
Grove Art Online
Grove Dictionary of Art Online
Oxford Art Online
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Oxford Art Online provides Web access to the entire text of The 
       Dictionary of Art with quarterly additions of new material
       and updates to the text, plus extensive image links and 
       all the sophisticated search advantages possible with an 
       online reference source.
https://ucd.idm.oclc.org/login?url=http://www.oxfordartonline.com
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