Use OneSearch to locate titles with an * next to them.
Think about:
Visit their home pages. Have they digitized materials? If they haven't digitized, have they published Finding Aids (which give you a good sense of what materials are contained in their collections)?
When searching a database of books, whether the catalog or Google Books or WorldCat:
Library Collections
Database
History of Women Collection, on microfilm
Pamphlets / Newsletters / Newspapers
Books
Oral histories (usually collected through interviews) are an increasingly popular method to preserve the past. Example: