Government

U.S. Department of the Interior Library - Focusing on the natural and social sciences; law; economics; management and use of natural and cultural resources; and the cultures and well-being of American Indians and Native Alaskans.
http://library.doi.gov/

National Library of Education - US federal government's resource center for education information.
http://ies.ed.gov/ncee/projects/nat_ed_library.asp

National Agricultural Library - Part of the Agricultural Research Service of the US Department of Agriculture.
http://www.nalusda.gov/

National Library of Medicine - US national provider of health-related library and information services.
http://www.nlm.nih.gov/

The National Transportation Library - US repository for transportation information.
http://ntl.bts.gov/

National Institutes of Health Library - Serving the US National Institutes of Health, with self-service access to others.
http://nihlibrary.nih.gov/

Canada Instititue for Scientific and Technical Information - Canadian research library for science, technology, engineering, and medicine.
http://cisti-icist.nrc-cnrc.gc.ca/

Herbert C. Hoover Building Library - Serving the US Department of Commerce.
http://www.osec.doc.gov/lib/

US National Information Infrastructure Virtual Library - Access to documents and information for the US component of Global Inventory Project (GIP) and the international registry for the G8 Global for Small and Medium-Sized Enterprises (SME) Testbeds.
http://nii.nist.gov/