Presidents may make rules and laws which bypass Congress through the use of Executive Order, Proclamation, and by other Presidential Actions.
You may also find them in the Public Papers of the Presidents as well as in 3 CFR, both of which are kept on the 3rd floor in Government Publications. Just ask for help. Further information about these papers may be found through the Government Publishing Office finding information page.
The Compilation of Presidential Documents has proclamations, executive orders, speeches, and other documents issued by the President. This Government Publishing Office web site has 1993-present.
Beginning in 1957, National Archives & Records Administration began to compile all the presidential public documents to create an official series of official writings, statements, addresses, remarks, and papers. This material is issued in chronological order and are issued roughly twice each year.https://www.archives.gov/presidential-libraries/research/guide.html
Companion series were added later including the Weekly Compilation of Presidential Documents
Public Papers of the President 1991-present; Print copies for earlier Presidents are in the Brooks Library under the call number J80.A283 (please check OneSearch for the exact call number).
Official Presidential Libraries go back to Herbert Hoover. They are under the purview of the National Archives and Records Administration (NARA). Since President Clinton, White House web sites were included in the Archives. In order to ensure access to government information on the Internet doesn't disappear between Presidential transitions, the End of Term Web Archive began in 2008. This project is cooperative between non-profits, academic institutions and the government to ensure access to government information.
For fun, take a look at NARA's Presidential Library Explorer. It is a visualization tool visualization presents the holdings of the Presidential Libraries in descending order from the library with the largest number of textual records to the smallest