"Showcasing over sixty short stories, poems, speeches, and articles, ... the first anthology of Mexican American writings about the U.S. war in Southeast Asia. "
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.