Map Librarian's Toolbox
Large scale geospatial data repositories of interest to Western North America
The mother of all GeoBlacklight repositories, Stanford’s EarthWorks searches many of the nation’s largest geospatial repositories.
Berkeley Library GeoData
California’s largest public-institution GeoBlacklight installation
USDA Forest Service Geodata Clearinghouse.
Regional data repositories have moved to the national clearinghouse.
Bureau of Land Management BLM Navigator
The US BLM controls a large amount of territory, primarily in the American West, and consequently is a major source of data.