"APU has access to the electronic full text versions of nearly all dissertations published in the U.S. since 1997 through a database called ProQuest Dissertations and Theses.
In PQDT, you can search for dissertations by author, title, keyword, advisor, or issuing university, then download a PDF version of the full dissertation (as long as it was published 1997 or later).
Older dissertations can be purchased directly from ProQuest through the ProQuest Dissertations and Theses database. Just click on the "Order a Copy" link" (Stephenson, 2009).