Note the call number. You will find some books in the catalog which are electronic. You can read them on a computer or mobile device.
Most mathematics books are in the QAs in the Library of Congress Classification System on the 6th floor of the Downtown Campus Library or on the lower level of the Evansdale Library.
Use E-ZBorrow to get books quickly from a group of Pennsylvania libraries called PALCI. The loan period is 12 weeks. You may request textbooks. Since subject searching is too slow, do title searches only.
Use interlibrary loan (the software is called Illiad) to get books and articles from other libraries. Login with your WVU credentials and complete a brief form the first time.