OpenDissertations The print index, Doctoral Dissertations Accepted by American Universities (DDAAU), is now available digitally as American Doctoral Dissertations 1933-1955ยช. EBSCO Information Services (EBSCO) and the Congregational Library & Archives in Boston worked together to digitize the content and build the free database from the volumes originally published by the H.W. Wilson Company. This effort was made possible through a donation from the H.W. Wilson Foundation.