GeoData@Tufts is the Tufts Geospatial Data Repository which allows you to search, discover, preview, interact, and retrieve geospatial data from university repositories. This is an excellent place to start looking for data!

 Categorized Online Data Sources

Subject	Geographic Region	Clearinghouses
This page lists sources by subject.Popular Topics: Agriculture Census (US) Energy Environmental Data Land Characteristics Transportation Water …See full list of topics here.	This page lists sources by geographic region.Popular Locations: Boston and Local Areas Massachusetts New England U.S. US States, Cities, and Metros International …See full list of topics here.	This page lists resources by spatial data repositories.Popular Topics: ArcGIS Online Geodata.gov EROS Data Center GeoCommons Finder! US National Atlas MapAbility.com …See full list of topics here.

Also, check out our tutorial on GIS Literature Search Tips for an overview on how to use Google Scholar to search for peer reviewed GIS Literature for a variety of applications.