Which book in library have dewy decimal numbers?

The Dewey Decimal Classification system assigns a unique number to each book based on its subject matter. For example, a book about psychology might have a Dewey Decimal number in the 150s, while a book on history could be classified in the 900s. Libraries typically display these numbers on the spine of books to help with organization and retrieval. You can find specific titles by searching the library's catalog using their Dewey Decimal classification.