1. Online Data Catalog Sites

• Stanford Libraries and Academic Information Services
  http://www-sul.stanford.edu/depts/gis/web.html - This is a very well organized site with some special topic areas as well as the main clearinghouses. Check out the site's web bookmark file for even more site.

• Tufts GIS Data Resources Guide
  https://wikis.uit.tufts.edu/confluence/x/k4BL - Tufts GIS staff maintain a listing of GIS data sites concentrating on international and US national clearinghouses, as well as New England states, cities and towns.

• Harvard University - Cartography and GIS Links
  http://hcl.harvard.edu/research/guides/cartography/resources/online.html - This site has useful links to both GIS and map sites.

• University of Arkansas Libraries - Geospatial and Attribute Data Links
  http://libinfo.uark.edu/gis/datalinks.asp - well organized data resource guide to state and national data.

• US National Data Sets
  For quick easy access to a multitude of nationwide data sets for the US, check the National Atlas (http://nationalatlas.gov/ - for data download, go to the link for "Mapping Professionals" and then "Raw Data."  If you are doing a national level GIS project or looking at a large region, this is a great site to use. If you want just parts of the US, use the National Map web site from which you can clip regions - http://nationalmap.gov/

• Free GIS Data by Region - Collins Software
  http://www.collinssoftware.com/freegis_by_region.htm - This is an excellent and extensive list of city, metropolitan, and state data sets, plus some good international data links, from Collins Software out of Houston, TX.