The Code of Federal Regulations (CFR) is a codification of the rules published in the Federal Register by Executive departments and agencies of the Federal Government. The CFR is divided into 50 titles which represent broad areas subject to Federal regulation, with environmental regulations contained mainly in title 40. Each volume of the CFR is revised once each calendar year. Title 40 is revised every July 1.
The Code of Federal Regulations (CFR) database - An electronic version of the paper edition of the CFR available from the Government Printing Office (GPO).
The Electronic Code of Federal Regulations (e-CFR) Beta Test Site - A joint project created by the Office of the Federal Register (OFR) and GPO to provide a frequently updated CFR.
CFR Title 40 : Protection of Environment - EPA's regulations updated on a frequent basis by linking to OFR's e-CFR prototype available on GPO's Web site.
Federal and State Government Regulation and Program References - Links to Federal regulations found in CFR Title 40 and State government regulation and programs for the U.S. territories and the 50 U.S. States.