This document provides information about how to use a card catalog system in a library to locate books and other resources. It explains that a card catalog contains individual cards arranged alphabetically with information like the author, title, subject, and call number of each item in the library. It discusses the different types of cards (author, title, subject) and shows samples. It also explains how call numbers are organized according to the Dewey Decimal System with books grouped by topic and assigned numbers in numerical order. The document aims to teach students how to navigate a card catalog to find resources independently in the library.