See the guide "Finding Primary Resources for Historical Research" for a more complete discussion of the library's resources.
Search the Randall Library catalog and WorldCat (see below for links) for history makers' names as authors. This should retrieve their memoirs, diaries and correspondence.
As you search subject topics in the catalog and WorldCat, note that the following subdivisions indicate primary source:
Caricatures and cartoons
Early works to 1800
Newspapers [e.g., African Americans -- Newspapers]
Notebooks, sketchbooks, etc.
Personal narratives (used in relation to specific events only)
Songs and music
Speeches, addresses, etc.*
*Used with individuals' names,classes of persons (e.g., soldiers), and organizations.