Answer:
- Catalog of U.S. Government Publications: http://catalog.gpo.gov/F?RN=428257209
- Library of Congress: THOMAS: http://thomas.loc.gov/
- Impact/ACCESS: http://www.auto-graphics.com/cgipac/mmx/unlv/Access
Additionally, this website contains a host of online sources of full-text government publications, divided by broad category (Federal, State/Local, Statistics, etc.) and by subject.
Category: