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site link
http://memory.loc.gov/frd/cs/irtoc.html#ir0015
http://www.britishmuseum.org
http://www.britishmuseum.org/pdf/22828_Booklet.pdf
http://www.metmuseum.org/Works_of_Art/viewOnezoom.asp?dep=3&zoomFlag=0&viewmode=0&item=31.13.2