Executive Branch: American Government

• American Presidency Project: Search veto messages from Washington to Obama. Under the Documents drop down menu on the home page choose from Oral: Remarks - Bill Vetoes, Written: Messages - Bill Vetoes, or Written: Statements - Veto Statements.
• Compilation of Presidential Documents: The Government Publishing Office (GPO) provides access to a wide variety of sources, including the Federal Register, State of the Union messages, and agency reports/investigations.
• Executive Branch Documents Related to Congress: These include veto messages, signing statements, and various publications associated with international treaties.
• Weekly Compilation of Presidential Documents: Published every Monday and is the official publication of presidential statements, messages, remarks, and other materials released by the White House Press Secretary." (GPO)

Additional Resources: 

• Presidential Signing Statements from American Presidency Project: Provides access to the signing statements of Presidents Hoover through Obama. Also includes an FAQ with an overview of the historical development of signing statements.
• Veto Messages: Printed as House or Senate Documents and can be searched in legislative databases like ProQuest Congressional as well as through Executive Office sources.