The Helmke Library Catalog is the first place to look for books. You can use Purdue Borrow to access collections at other Purdue campuses using the catalog as well.
Dissertations, often book-length, are written as part of the process of received a doctoral degree. This archive includes the full-text of most recent dissertations and includes information back to 1861.
Presents citations and images for over 125,000 works from such sources as Pollard & Redgrave's Short Title Catalog (1475-1640), Wing's short-title catalog (1641-1700), and the Thomason Tracts (1640-1661).
Search the full text of books. Copyright (as applicable) will prevent you from reading the full text in Google. If you find a book of interest, search Helmke Library's Catalog or WorldCat to locate a print or digital copy.
An extensive collection of digitized books, with both freely accessible and member-only titles. Sponsored by a consortia and a partnership of academic institutions.