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

National Library of Education  
   US federal government's resource center for education information.
   http://www.ed.gov/NLE/

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

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

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/

NIEHS Library  
   US National Institute of Environmental Health Sciences.
   http://library.niehs.nih.gov/

Border Environment Cooperation Commission Library  
   Supporting the environmental infrastructure information needs of the BECC/COCEF in the Mexico/US border region. Site includes access to BECC library catalogs and online databases, library request services and manuals, links to other resources, and resourc
   http://www.cocef.org/Biblioteca/biblioteca4.html

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/

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

LOREG - Local and Regional Government Library  
   Online library on local and regional democracy in Europe, including national laws and other official documents from European states and the Council of Europe.
   http://www.loreg.coe.int/

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

Energy Library  
   US Department of Energy. Collections of former Atomic Energy Commission, Energy Research and Development Administration, and Federal Energy Administration.
   http://www.administration.doe.gov/admin/library/