The fourth floor of the library is arranged by the Library of Congress classification system. This means that books are arranged by subject and call number, rather than by author. For example, the book A Farewell to Arms, by Ernest Hemingway, holds the call number PS3515.E37 F4 1969. This indicates that it can be found in the PS section (American Literature), and that it was published in 1969. When you find the book or subject you're looking for, signs on the fourth floor can point you to each subject section.
To see a full list of the Library of Congress classification system (and what subject each section represents), you can check out the Library of Congress website for more information. Otherwise, simply search for the topic you're interested in using our library's main search page, and the catalog will tell you where to look for each book you find.
