Master’s and doctoral degree databases from universities in the United States, Canada and renowned academic institutions around the world. Dating back from 1997-present.ProQuest Dissertations & Theses (PQDT) Global is the world's most comprehensive collection of dissertations and theses from around the world, offering millions of works from thousands of universities. Each year hundreds of thousands of works are added. Full-text coverage spans from 1743 to the present, with citation coverage dating back to 1637.