A set of digitized avant-garde book covers is available on Flickr. The collection features early-twentieth century typography, including Latin American books and artist Joaquín Torres Garcia. There are also subsets featuring the Futurists and Dutch and Russian books.
The Frick Collection has recently released two databases that focus on provenance of artworks. The Archives Directory for the History of Collecting in America helps researchers locate primary source material about American collectors, dealers, agents and advisors, and the repositories that hold those records. The Archives include collectors who purchased American art, but also antiquities and non-Western art. The Montias Database of 17th Century Dutch Art Inventories provides detailed information on ownership of works of art during the Dutch Golden Age. It was compiled by late Yale University Professor John Michael Montias, and contains information from 1,280 inventories of goods (paintings, prints, sculpture, furniture, etc.) owned by people living in 17th century Amsterdam.