American Doctoral Dissertations This link opens in a new windowAmerican Doctoral Dissertations™ has been expanded to offer greater coverage of 20th Century research as well as access to full text. The enhanced database includes more than 153,000 theses and dissertations in total, including 70,000 new citations for theses and dissertations from 1902 to the present. The new citations include a link to access the full text, when available, via the Institutional Repository where the thesis or dissertation is housed such as OhioLINK, Rochester Institute of Technology and North Carolina State University.