Books have been pre-sorted into approximately 80 categories, including:

Agriculture Antiques and Collectibles Archaeology
Architecture Art Bibles
Biography Business / Finance Children’s
Christian Fiction Classics Cliff Notes / Spark Notes
Coffee Table Books Computers Conspiracy / Folklore
Cookbooks Crafts Diet / Medicine / Nutrition
Education Fantasy Fiction
Foreign Language Games Gardening
Gender Studies Gift Books and Journals Graphic Novels
Historical Fiction History Hobbies / DIY
Horror Human Rights Humor
Inspiration / Inspirational Fiction Legal Case Studies Literature
Literature Sets Local Interest Mathematics
Military History Military/Techno Fiction Movie/TV books
Music Mystery/Suspense Mythology
Nature/Ecology Non-fiction Occult
Parenting Pets/Animals Philosophy
Plays Poetry Politics/Political Humor
Psychology Puzzles Reference Materials
Religion Romance Science
Science Fiction Self-Help Sex
Short Stories Signed Books Sociology
Software/CD/Cassettes Sports/Fitness Teaching Guides
Text Books Travel True-Crime
US History Videos World History
Yearbooks Young Adult