American Institute of Certified Public Accountants - Historical Standards
Statements on Auditing Standards 1(1973)-101(2003) are reproduced here as originally published. The series started in 1973 and superseded the Statements on Auditing Procedure. The Statements are annually codified in the Professional Standards (see below) and in the Codification of Auditing Standards (generally published in January of each year).
Also available: U.S. Auditing Standards (1976-2007)