I have been digging into boxes in my "black hole" looking for anything related to Cambodian numismatics. I found a 12-page paper with the title of A Trial Listing of the Early Coinage of Cambodia 1580-1902 by Professor Steven R. Young. It is photocopied on the back of paper from the Cash Coin Connection issue of August 15, 1992, so I am thinking it was written at about the same time, but it could have been years later.
If any reader knows Professor Young, please have him contact me at HADaniel3@MSN.com. I would very much like to know if he is still interested in Cambodian numismatics, and if he has learned more about it since he wrote the paper.