Primary sources are created around the time of an event, or by someone who witnessed the event. Examples include newspapers, letters, diaries, memoirs, autobiographies, etc...
MANY primary sources are not online.
Use The CAT to find early printed books, government documents, maps, videotapes, sound recordings, music scores and many other types of materials. Limit your CAT search by date to find documents produced near the time of the event you are researching.
Microfroms & Government Information contains primary source documents in microformat (microfilm, fiche, etc...)
Below are some keywords you can use in The CAT to locate published primary documents:
Personal papers and other unpublished primary sources can usually only be accessed at the library or archive holding the original documents. These databases and websites will help you discover collections in other libraries, historical societies, and archives.