This document defines and provides details about different types of general references: atlases, bibliographies, almanacs, dictionaries, and encyclopedias. It explains that an atlas is a collection of maps that includes geographic and statistical information. A bibliography is a compilation of sources of information on a specific subject or author. An almanac contains annual tabular information like weather forecasts and tide tables. A dictionary defines words and confirms their spelling, pronunciation, and usage. An encyclopedia summarizes knowledge on a topic in a comprehensive but concise way, providing facts and a broad overview.