http://digital.library.cornell.edu/m/math/

"The Cornell University Library Historical Math Monographs Collection has a rather interesting history. The collection began when a number of brittle and decaying math monographs were digitally scanned using equipment developed by Cornell and the Xerox Corporation. This collection brings together all of those documents, including a selection of other relevant papers and scholarly works. All told, there are over 1,000 works here, and visitors can use the "Browse" section to look over the offerings by title or author. Additionally, visitors can perform detailed searches across the entire collection. Visitors should also take a look at the "Selected Titles" on the homepage to get a sense of what lies within this rather compelling collection. Finally, there is a "Help" section that provides some hints on making the best use of the site."

Source:  The Scout Report from the University of Wisconsin, 27 Feb, 2009