The President of the United States issues documents, including executive orders and proclamations, messages to Congreee, agency reorganization plans, speeches, signing statements, remarks, and letters.  Many of these documents are published in Title 3 of the Code of Federal Regulations and compiled in other sources.

Title 3 - Code of Federal Regulations

• HeinOnline - CFR Library: (1938-present)
• LexisNexis: updated daily; (1981-present)
• Westlaw: updated daily; (1984-present)
• FDSys (GPO Federal Digital System): (1996-present)
• e-CFR (GPO): not official, but updated daily

Federal Register

• HeinOnline - Federal Register Library: (1936-present)
• LexisNexis - updated daily; (July 1980-present)
• Westlaw - updated daily; (July 1980-present)
• FDSys (GPO Federal Digital System) - (1994-present)

Daily Compilation of Presidential Documents

• HeinOnline: via Federal Register Library; (2009-present)
• FDSys: (1992-present) 

Weekly Compilation of Presidential Documents: (1965-2009)

• Law Library Microfiche J80.A284; (1965-2007)
• HeinOnline: via U.S. Presidential Library; (1965-2009)

Public Papers of the Presidents - compiled annually

• LLMC Digital: (1929-2001)
• HeinOnline: (1929-present via U.S. Presidential Library)

National Archives: Presidential Documents Research Guide

LexisNexis: (1981-present: executive orders and proclamations)

Westlaw: (1936-present: executive orders); (1984-present: other documents)