Many primary source collections are available online. The library provides access to such extensive digital resources as Early English Books Online (EEBO) and Eighteenth Century Collections Online (ECCO).
For more titles beyond the selection below, see these Tricollege resource lists:
Still other sources are available in printed form.
Those that have been edited, reprinted in facsimiles, or transferred to microfilm can be borrowed through E Z Borrow or interlibrary loan if they are not in Tripod.
Books printed prior to the middle of the nineteenth century century are usually kept in libraries' rare book collections. You can go to Bryn Mawr, the University of Pennsylvania, and other local libraries to see the older books which they own.