Here is a nice little tutorial on the
codification of Positive Law courtesy of the Office of the Law Revision Council.
Current Positive Law Codification Projects of the Office, including five new Titles to the USC: Title 35, "Patents, Trademarks, and Other Intellectual Property"
Title 41, "Public Contracts"
Title 51, "National and Commercial Space Programs"
Title 52, "Voting and Elections"
Title 53, "Small Business"
Title 54, "National Park System"
Title 55, "Environment"