This collection covers more than 7,000 titles assembled in cooperation with the Yale University Library and the Newberry Library on the exploration, settlement, and development of the Trans-Mississippi West. Geographically it covers from the Mexican borderlands to the Arctic; the Mississippi to the Pacific.
Among the topics covered are:
Many of these titles are in the public domain and can be found in HathiTrust, Google Books, or the Internet Archive.
In addition, databases from Adam Matthew contain many of the same publications.