HeinOnline – UT database.
See the U.S. Presidential Library. Includes Kennedy assassination reports, presidential papers, and many more primary source materials.
ProQuest Congressional - UT database.
Full-text collections available using Advanced Search include the U.S. Serial Set, 1789-1969, and congressional reports, documents, and hearings from 1800s to present.
Govinfo - GPO's Federal Digital System
GPO Access - Compilation of Presidential Documents
A service of the U.S. Government Printing Office (GPO) that provides free access to the official, published versions of documents produced by the Federal Government.