All three branches of the federal government produce law. The State of Minnesota also has statutory, administrative and case law. To research case law, you will need to go to a law library, for example, the Hennepin County Law Library at the Hennepin County Government Center or the University of Minnesota Law School Library. Bills are proposed legislation which may be introduced in either the House of Representatives or the Senate and are the first step in the long process of making statutory law. They are numbered sequentially within each two-year session of Congress.
Most bills never become law.
The set of microfiche is accompanied by a paper finding list which is arranged by bill number. It includes subject indexes, tables showing the status of bills and records of congressional actions and presidential vetoes. It is also useful for finding bill numbers. Status of current bills can also be tracked on the Internet at the sites listed above for bills. A slip law is designated by a public law number indicating, first, the Congress in which it was enacted and, second, the chronological sequence of enactment within a given Congress, e.g. Public Law 104-28.