Each book is given a Library of Congress call number.
Call numbers are arranged alphabetically, and then by whole number (everything before the first period in the call number).
A call number is like a book's address, and books on related topics are located next to each other on our shelves. Click here to find out what call numbers are assigned for particular subjects:
Dictionaries, encyclopedias, etc. from a variety of sources.
Reference books by Oxford University Press, including the Oxford Digital Reference Shelf.
Online reference works from a variety of publishers.