A primary source is a document produced within a particular historical context. Examples include works of fiction, poetry, drama and art, plus letters, diaries, autobiographies, speeches and interviews. The document may have published close to the time it was written, at a later time, or it may not be published at all, as is the case for many items in archival and manuscript collections. See Finding Primary Sources - Library of Congress Subject Headings (from MIT Libraries) for subject keywords to use when searching the Primo Library Catalogue.