This document provides an overview of library cataloging and searching. It discusses two main principles: that cataloging is exacting and computers are not intelligent. It then explains some important MARC fields like author, title, and subject headings. It notes that Library of Congress subject headings can be strange and provides some examples. The document offers tips for effective library searches, including using keywords, subject headings, and sorting and limiting search results. It concludes with suggestions for further reading on MARC and unusual LC subject headings.