There's no one thing, but for historians, it's generally something that was created at the time of the event. Try searching using terms like: biography [also use for autobiographies], newspapers, "personal papers" [use for archival material], correspondence [use for letters], personal diaries, photographs, videos, interviews, pamphlets, artwork, sources [a common one!], and many other types of things!
Open up questions rather than to come up with answers! What kinds of questions can you explore with the source you have? How does your source fit into the themes you've explored, particularly using a theoretical frameworks as a guide? Use the following questions to help guide your description of your primary source (derived from Mary Lynn Rampolla, A Pocket Guide to Writing in History):
The National Library of Medicine (NLM) has a large and extensive history of medicine collection. As part of the library's mission to provide access and preserve its collection of books, ephemera, pamphlets, posters, etc, the library has created several digitized collections.
Questions? Contact reference@carleton.edu
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