You may also find discussions of tests in the major subject databases of PsycINFO and ERIC.
You can get a copy of most dissertations from ProQuest/UMI for a fee. You'll need to search ProQuest Dissertations & Theses (PQDT) -- formerly Dissertation Abstracts -- to get a record number to order it.
Why would an ILL request for a dissertation be denied? Sometimes other libraries simply do not circulate their dissertations. In other cases, it may be that the lending institution has moved to electronic dissertations, and (like UGA) the author is able to designate access to the campus network.