Helpful Links

Federal Register 
Federal Register via GPO 
U.S. Code  
U.S. Code (USC) via US House of Representatives (Searchable)
U.S. Code (USC) via Cornell (Searchable by Title and Section)
Note that the United States Code can also be accessed through GPO Access at the Federal Depository Library Sites.
CFR - Code of Federal Regulations 
Code of Federal Regulations  
FAR - Federal Acquisition Regulations  
Federal Acquisition Regulations (FAR) - General Services Administration
FAR via USGI
FAR Search Engine via University of California  
FAR Supplements 
Agriculture Acquisition Regulations (AGAR) with Circulars Incorporated and Agriculture Acquisition Circulars (AAC)(from USDA)
Defense Federal Acquisition Regulation Supplement (DFARS) and Procedures, Guidance, and Information (PGI) (from DPAP)
Defense (DFAR) FAR Supplement (from USGI)
Army FARS
Department of Transportation TAR (from DOT)
Environmental Protection Agency EPAAR (from EPA)
NASA FAR Supplement (from NASA)
NASA FAR Supplement (from USGI)
DOE FAR (DEAR) Supplement
DOE FAR (DEAR) Supplement (from USGI)  
CAS - Cost Accounting Standards 
CAS  
Standard Federal Agency Policies 
Air Force Office of Scientific Research
Army Research Office
Department of Energy
Environmental Protection Agency Federal Demonstration Partnership (FDP)
National Aeronautics Space Administration
National Science Foundation
Office of Naval Research U.S. Department of Agriculture
U.S. Department of Education
U.S. Department of Defense
Miscellaneous
Export Control Regulations
 
Circulars 
General
Educational Institutions
Nonprofit Institutions
Profit Organizations
State and Local Governments
Legislation
Regulatory Information
 
Export Control 

Use the decision tree to determine if you need an export control license.
http://export.stanford.edu/tree/index.html 

University Industry Demonstration Partnership
http://sites.nationalacademies.org/PGA/uidp/index.htm