Dumbarton Oaks Research Library holds almost 2000 microfilm rolls that are reproductions of medieval and early modern manuscripts, the originals of which are held in institutions around the world. In 2011, the Library began a project that included the creation of a database to serve as a finding aid for the Library’s microfilm holdings. Thanks to the combined efforts of Library and Publications staff, a version of that database, with information about 1252 microfilm and 1221 manuscripts, is now available on the Dumbarton Oaks website.