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http://www.nga.gov/gemini/home.htm
Famous printing house, gives great detail on prints made by their famous printers including Warhol and Lichtenstein. Detailed images.
http://www.ifrance.com/golem
http://www.chagall.fr/
http://www.tamu.edu/mocl/picasso
The catalogue raisonne is a work in progress, but a good online resource. Most of Picasso's printed catalogs are difficult to find and very expensive. This site is run by a Texas A & M Professor of Spanish Studies.
http://www.audubon.org/nas/art.html
brief but useful info page.
Neiman’s official site, maintained by his publisher. Includes commentary for collectors by the artist.
This site is maintained by a gallery that published many of Warhol’s works. The information is endorsed by the Warhol estate.
http://www.sonofthesouth.net/Winslow_Homer.htm
Not a comprehensive data source, but pictures all of Homer’s prints for the popular 1800s magazine.
http://www.printcouncil.org/search.html
This lists about all of the catalogues raisonne ever published.
http://www.artrenewal.org/2008/10/william-bouguereau-catalog-raisonne.asp
http://www.firstpulseprojects.com/bill.html
http://www.en.lempickacatalogue.com:86/
http://www.willardmetcalf.com/
Famous auction house, provides online images and descriptions of many prints currently in auction.
Images and descriptions of current auctions.
http://www.auctionbytes.com/cab/abu/y204/m08/abu0124/s06
http://www.printcouncil.org/search.html
http://www.catalogueraisonne.org/
https://www.delaszlocatalogueraisonne.com/
http://econtent.unm.edu/cdm4/index_tamarind.php