Many primary-source documents from have been reproduced in books commonly held in research libraries. You can use Library Search to retrieve this material. Select Books & Media from the header.
Try adding keywords such as Correspondence, Diaries, Interviews, Personal Narratives, and Sources along with your research topic to identify printed primary sources. You can also filter by these terms in the facets to the left after you search.
When you find a title of interest, for example, a primary source by on individual experiences in the Mexican Revolution, you can select the hyper-linked subject in the item record to find additional titles. Sample subject heading: Mexico — History — Revolution, 1910-1920 — Sources