All datasets are downloadable from the following URL:
DLGs - Digital Line Graphs produced by the United States
Geological Survey. DLGs consist of several layers of 1:24,000 ...
The California Gap Analysis Project is publishing a CD-ROM to
provide you with a handy way to obtain the entire GIS database,
final report, and an interactive atlas of California's biodiversity.
This dataset consists of a digital geologic map for the state of Colorado.
This geologic map was prepared as a part of a study of digital methods and
techniques as applied to complex geologic maps. ...