There are two print copies of each APU dissertation, and these these are located in the Thesis Collection. Unfortunately, these are archival copies and are non-circulating, so they can only be viewed in the library.
You can do the following catalog search to see all of the APU dissertations (click on image):
A large portion of APU student dissertations are also uploaded to the ProQuest Dissertations & Theses Database. Here you can search by author, title, keyword etc., and search across the material from both APU and other institutions.