When a bill is signed by the President into law, it is called a Public Law and immediately assigned a number and printed.
Session Laws - Annual publication of public laws in chronological order in United States Statutes at Large
The U.S. Code is the official codification by subject matter of the general and permanent laws of the United States. It is divided by broad subjects into 50 titles and published by the Office of the Law Revision Counsel of the U.S. House of Representatives.
There are two unofficial annotated versions of the U.S. Code
Congress.gov - pdf public laws beginning with the 93rd Congress going forward (1973).
GovInfo - pdf public laws beginning with the 104th Congress going forward (1995).
Lexis - Public laws beginning with the 85th Congress going forward (1957-1958)
Westlaw - Public laws beginning with the 93rd Congress going forward (1973-74).
Bloomberg Law - Statutes at Large beginning with 1976.
HeinOnline - pdf Statutes at Large, beginning with Vol. 1, 1789.
Current U.S. Code via the Office of the Law Revision Counsel of the House of Representatives.
GovInfo - current U.S. Code plus older versions, beginning with 1994.
Cornell's Legal Information Institute - current U.S. Code.
Lexis - current U.S. Code Service
Westlaw - current U.S. Code Annotated
Bloomberg Law - current U.S. Code
Brooklyn Law School Library has the following titles in hard copy located in the Statutes Collection in the Zwanger Reading Room on the second floor.