These collections are available on Microfilm at Frost Library. If you are new to microfilm, check out this video tutorial on using microfilm, microfiche, and the machines you use to read them.
Scholars and publishers compile collections of primary sources that can be found in library collections, such as the Five College Catalog or World Cat. Examples include published manuscripts, diaries, or letters of an individual (Lincoln in Private), or sources related to a particular topic (Land and Labor, 1866-1867).
To locate primary sources in Discover, do a search combining keywords for your topic and terms for the kind of source you are looking for.
Common subject terms for primary sources include:
For a more exhaustive list, with examples, see MIT Libraries' page on primary source subject headings.