Government Agencies

Immigration and Naturalization Service
http://www.ins.usdoj.gov/
(800) 755-0777

Internal Revenue Service (IRS)
http://www.irs.gov/
(800) 829-1040

Selective Service Registration
http://www.sss.gov/regist.htm
(708) 688-6888

Social Security Administration
(800) 772-1213

U.S. Department of Labor's Occupational Outlook Handbook (information on various careers and their potential earnings)
http://www.bls.gov/oco