"The Code of Federal Regulations (CFR) is the codification of the general and permanent rules published in the Federal Register by the executive departments and agencies of the Federal Government. It is divided into 50 titles that represent broad areas subject to Federal regulation."
This database from the Colorado Office of Economic Development and International Trade works to provide licensing information for industries regulated by Colorado state agencies. Select the category that closely matches your business for possible Colorado licensing/permit requirements for your business.
This source is an annotated version of Colorado laws that have been enacted each legislative session. Although this source does not provide the laws , the wording often refers to a regulating agency for an industry. The appropriate agency can then be contacted for those industry regulations. The Colorado web site has a list of agencies at: http://www.dora.state.co.us/