Searching for books beyond Vermont State College libraries' holdings
Worldcat is a very large union catalog that includes the holdings of most U.S. academic libraries.
Google Books permits searching the full content of some books. For many books, there is a significant chunk of the book available as a preview. Books in the public domain (not copyright protected) are available online.
Interlibrary loan, to obtain books not available in a VSC library:
If you find a book (or other item) of interest that the VSC libraries don't own, you can request it through interlibrary loan.