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Code of Federal Regulations
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Cornell's Legal Information Institute
This collection is intended to make the law more available to the public.  It includes a wide variety of legal resources, such as the US Constitution, the US Code, the Code of Federal Regulations, Federal Rules, Select Supreme Court decisions, and many state resources as well.

​Electronic Code of Federal Regulations (e-CFR)
The Electronic Code of Federal Regulations (e-CFR) is a currently updated version of the Code of Federal Regulations (CFR). It is not an official legal edition of the CFR. The e-CFR is an editorial compilation of CFR material and Federal Register amendments produced by the National Archives and Records Administration's Office of the Federal Register (OFR) and the Government Printing Office. The OFR updates the material in the e-CFR on a daily basis. The current update status appears at the top of all e-CFR web pages.

GovInfo
Govinfo.gov replaced the Federal Digital System (FDsys) in 2016 as the official provider of government information in both text and PDF format. It includes U.S. bills, laws, congressional documents, the Federal Register and Code of Federal Regulations and thousands of other federal government publications. (Formerly GPO Access)

Justia
Justia provides free case law, codes, regulations and legal information, including federal dockets and filings.

Regulations.gov
Submit your comments on proposed regulations and related documents published by the U.S. Federal government. You can also use this site to search and review original regulatory documents as well as comments submitted by others.

Code of Colorado Regulations
The Secretary of State compiles and publishes the administrative rules of the executive agencies of the state of Colorado in the Code of Colorado Regulations. The official Code and Register published pursuant to § 24-4-103(11), C.R.S., can be accessed from this website. Notices of rulemaking, proposed rules, new and amended rules, and Attorney General rules opinions are published monthly in the companion publication, the Colorado Register.

Colorado Code of Regulations by Agency/Department