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.
2. PQDT Open
PQDT Open provides the full text of open access dissertations and theses free of charge. You can quickly and easily locate dissertations and theses relevant to your discipline, and view the complete text in PDF format.
OATD is an index of over 3.5 million electronic theses and dissertations (ETDs). The best possible resource for finding open access graduate theses and dissertations published around the world.
EBSCO Open Dissertations now includes the content from American Doctoral Dissertations. It is a free database with records for more than 1.4 million electronic theses and dissertations from more than 320 universities around the world.