This document provides an overview of common reference materials including encyclopedias, dictionaries, almanacs, thesauruses, and atlases. It describes what each reference material contains and how it can be used. Encyclopedias contain broad overviews of topics, people, and places. Dictionaries provide spellings, meanings, pronunciations, and parts of speech for words. Almanacs contain up-to-date facts, charts, maps and tables published annually. Thesauruses list synonyms and antonyms to help find alternative word choices. Atlases collect maps of various geographic regions or the entire world.