This page provides access to four different types of publications: (1) the Introduction to Information is intended for the layman who needs to a brief overview of information as a foundation for working with computerized information; (2) the Introduction to Computerized Information provides the next advanced level of concepts; (3) the Basic References build on the first two publications. Since there are hundreds of computerized geographic information publications, the Basic References provide a foundation for the (4) Supplementary References with additional information.