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The collection includes doctoral dissertations submitted to institutions outside the U.S. and Canada. The range of years includes mid-19th century through the present, with the greatest concentration in the late 19th, early 20th centuries.
The Networked Digital Library of Theses and Dissertations (NDLTD) is an international organization dedicated to promoting the adoption, creation, use, dissemination and preservation of electronic analogues to the traditional paper-based theses and dissertations. The collection includes over 200,000 theses and dissertations from around the world.