To find dissertations from North American universities:
ProQuest Dissertations & Theses GlobalProQuest Dissertations & Theses Global is the world's most comprehensive collection of dissertations and theses from around the world, spanning from 1743 to the present day and offering full text for graduate works added since 1997, along with selected full text for works written prior to 1997. It contains a significant amount of new international dissertations and theses both in citations and in full text.
Regional Open Access Dissertations
The following list of databases provide access to regional dissertations and theses. The list does not include single institution repositories.
Dissertations & Theses @ Andrews UniversityMost Ph.D. dissertations, selected D.Min. dissertations, but does not include M.A. theses. 1976-present.
Licensed database, requires authentication with AU username and password.