California Code of Regulations (CCR) consists of 28 titles and contains the regulations of approximately 200 state regulatory agencies.
Example of a CCR citation:
27 CCR § 22190
(Title 27 of the California Code of Regulations, section 22190 -- Title 27 is Environmental Protection)
(The Federal Regulatory Timeline, from regulations.gov)
The Code of Federal Regulation (CFR) consists of 50 titles representing broad subject areas that are subject to federal regulation.
Example of a CFR citation:
40 C.F.R. § 503.33
(Title 40 of the Code of Regulations Section (or Part) 503.33)
The Federal Register is the official daily publication for rules, proposed rules, and notices of Federal agencies and organizations, as well as executive orders and other presidential documents.
Example of a Federal Register citation:
63 FR 14109 (March 24, 1998)
(Volume 63 of the Federal Register on page 14109 posted on March 24, 1998)