Each book has a unique call number, which provides an address or location for the item, and also provides valuable information about it, such as the subject, first letter of the author’s last name, and date of publication.
Call numbers appear on the spine of books and in the Library Catalog:
In the LC Classification System for Literature, here is a sampling of how the call number would begin:
P Language and Literature
PN General Literature
PR English Literature
PS American Literature