These are documents from the legislative record, and not links to the actual documents. The link to access legislation is  THOMAS -- U.S. Congress on the Internet

 Homeland Security Act of March 21,2001 (Congress)

 Homland Security Act of March 29, 2001 (Congress)

 Homeland Security Act October 2, 2001 (Congress)

 Homeland Security Act 10/4/2001 (Senate)