Gardner, Percy, The Coinage of Parthia, Originally Published 1877, reprinted by Sanford J. Durst, Rockford Center, NY, 2000, 68 pages, 7 plates, softcover. A classic early work on the history and coinage of the Parthians. The history is easy to read, though sketchy. The plates are clear enough to be useful, and there are tables comparing legends and titles of different rulers, ex James Farr Collection Library.
Estimate: 10-20 USD