This reference manual is designed to provide a comprehensive introduction to demographic data from the Census Bureau and is specifically designed for use by instructors participating in the Census Bureau college curriculum support project. The purpose of the manual is to provide an appropriate and up-to-date starting point for the new or prospective user of census statistics. It can also be used as a reference tool for the experienced data user. Presented in outline form to help instructors develop lecture material, the manual presents those facts or principles most relevant to understanding the 1970 census and related data. Ten chapters comprise the reference source. Following an introduction to the services and surveys offered by the Census Bureau, chapters follow relating to specific aspects of demographic data: subject content, geographic concepts, printed reports, computerized products and related services, unpublished data on microfilm or printouts, caveats and limitations of 1970 data, current demographic data, reference sources; and information about finding specific data. Numerous tables, charts, and graphs are included throughout the document. (Author/JR)