OpenDissertations, formerly American Doctoral Dissertations, is an open-access database built to assist researchers in locating both historic and contemporary dissertations and theses. Created with the generous support of the H. W. Wilson Foundation and the Congregational Library & Archives in Boston, it incorporates EBSCO’s previously released American Doctoral Dissertations, 1933-1955, and features additional dissertation metadata contributed by select American colleges and universities. Providing researchers with citations to graduate research across a broad span of time, from the early 20th century to the present, this database will continue to grow through regular updates and new partnerships with graduate degree-granting institutions. The subset of this database, American Doctoral Dissertations, 1933-1955, provides electronic access to the only comprehensive record of dissertations completed during that time period, the print index Doctoral Dissertations Accepted by American Universities. Containing twenty-two years of dissertation research and amounting to nearly 100,000 citations, this index was compiled annually for the National Research Council and The American Council of Learned Societies by the Association of Research Libraries. It was published by the H. W. Wilson Company.