For the nitty gritty details of Library of Congress Classification, see their outline.
Search Dragon OneSearch for everything the library has access to - articles, books, films, ebooks, music, images, etc. Use the Refine my Results toolbar to the side of the screen to narrow your search.
Books on the 3rd and 4th floors are the ones you would most likely use for college papers. They are classified and labeled using the Library of Congress system. The code or call number on the library website record will be on the book. Match the code in brackets to the label on the side or front of the book. Books on similar topics will be grouped together.