Amateur radio service in the United States is regulated by the Federal Communications Commission (FCC). These are the most relavant FCC regulations for Amateurs:

2006 - CFR47 part 97 Amateur Radio Service, October 1, 2006 revision.

2006 - CFR47 part 97 Amateur Radio Service, May 3, 2006 revision.

2004 - CFR47 part 97 Amateur Radio Service, 2004 revision.

2003 - CFR47 part 97 Amateur Radio Service, 2003 revision.

2001 - CFR47 part 97 Amateur Radio Service, 2002 revision.