ProQuest Dissertations and Theses (PQDT) is a multidisciplinary database that contains entries covering Arts, Business, Education, Humanities, Social Sciences,  and the Behavioral, Natural and Physical Sciences. With over 3 million entries it is the most comprehensive  dissertation and thesis collection in the world. It contains almost all dissertations written at the University of Illinois in full text since 1997 and a substantial amount of theses in full text.