The official certified copy of each bill which becomes a law is placed in the custody of the Secretary of the Commonwealth and filed in the Department of State. It then loses its identity as a bill and becomes an "Act of the General Assembly." Each statute is assigned an act number in the chronological order in which they are finally enacted beginning with No. 1 for the first bill enacted by the General Assembly during each regular or special session. When published in the Laws of Pennsylvania, each statute is assigned a "P. L." number conforming to the number of the page of the Laws of Pennsylvania where the statute begins.
101 Pa. Code § 9.128