"The Legacy Project documents and preserves the creative process of America's most esteemed dramatists in a series of filmed conversations, each featuring an established stage author (or team of collaborators) and an emerging one. John Guare is interviewed by Theresa Rebeck."
"Playwright August Wilson talks about his roots in the black community, how his plays express the African-American experience, how the African heritage of Black Americans is both expressed and repressed in American society today, and the importance of blues as cultural expression."
Suggested terms to look for include - diary, diaries, letters, papers, documents, documentary or correspondence.
Combine these these terms with the event or person you are researching. (example: civil war diary)
Also search by subject for specific people and events, then scan the titles for those keywords or others such as memoirs, autobiography, report, or personal narratives.