Q. What are call numbers?

Our books are arranged by subject according to the Library of Congress Call Number Classification system, which is used by large academic libraries in the United States. Call numbers are like unique addresses made of both letters and numbers for every item in the library so we can find exactly where that item is. The first few letters and numbers indicate the subject, the next few refer to that specific title, then there's the publication date and copy info. (Here's how that works.)