Lafayette College Library

The National Historical Geographic Information System provides, free of charge, aggregate census data and GIS-compatible boundary files for the United States between 1790 and 2010. Users must register to download data.

Tool for locating, downloading and visualizing census data and other demographic information from current and historic sources. Includes the entire US Census from 1790 to 2000, all annual updates from the American Community Survey, and the Religious Congregations and Membership Study from 1980 to 2000.

Indexes the literature of geology, including journals, books, conference proceedings, maps, and USGS reports.