Executive Orders and Proclamations derive their legal authority either from existing statutes or from other constitutional authority given to the President. They do not have to be approved by Congress. Presidential Executive Orders and Proclamations are required to be published in the Federal Register unless there are National Security concerns. They are then compiled in the annual volume of Title 3 of the CFR.
An Executive Order is generally addressed to government officials and agencies while a Proclamation is generally addressed to the entire nation and tends to be more ceremonial in nature.
A Presidential Signing Statement is a written comment issued by a President at the time of signing legislation.
Weekly Compilation of Presidential Documents (See below)
Westlaw Presidential Documents database (law students & faculty only)
National Archives and Records Administration: http://www.archives.gov/
University of Cincinnati Libraries
PO Box 210033 Cincinnati, Ohio 45221-0033