For my first book project I visited the Millikin University’s Staley library and checked out:
Hoffman, Stanley, ed. Contemporary Theory in International Relations. Englewood Cliffs: Prentice-Hall, Inc., 1965.
Browsing the library catalogue I noticed that the Staley library did not use the standard Dewey Decimal classification system but rather the Library of Congress classification system. Learning about the LOC classification system was a welcome bonus to my project.