ProQuest Dissertations & Theses Global (1743 to present) Over 3.8 million citations to doctoral dissertations and masters theses from North America; over 2.1 million of these (most dating from 1997 to present) are available full text. Also includes a growing number of dissertations from international universities, including University College London, the London School of Economics and Political Science, and the Universities of Aberdeen, Bath, Cardiff, Leicester, and Valencia.