One of the very few publications to exploit the Persepolis Fortification Tablets in Aramaic is David Nasgowitz's 1966 University of Chicago A. M. Thesis: THE RISE OF ARAMEAN SCRIPT IN MESOPOTAMIA AND ITS ENVIRONS (IRAQ). Nasgowitz was a student of Raymond Bowman's and had access to Bowman and his notes. To the best of my knowlege this thesis is available only in the University of Chicago Library (Regenstein), and in the Oriental Institute's Research Archives.
It is in fact available for sale from UMI/ProQuest.
[Between the time I originally posted this on November 28, 2006 and today, this title became available at ProQuest in a downloadable pdf form. Those of you whose institutions subscribe to ProQuest can now acquire this book free of charge]