Paris. Photo by Shannon K. Tanhayi Ahari.
Primary sources are "first-hand" information, sources as close as possible to the origin of the information or idea under study. Primary sources are contrasted with secondary sources, works that provide analysis, commentary, or criticism on the primary source.
Note that the "primacy" of a source can be relative. In cases where original records were lost or a live performance was never recorded, a review or commentary from a third party may be the most primary source available.
(From the Primary Resources and Archives Research Guide)
Some works can only be found on microfilm or in special collections and archives. The following list is a brief selection of the large microfilm set titles UCLA owns in the library or as a member of a consortium - in the Center for Research Libraries. Each set includes a large number of works.