Hi Sunn, I’d start with the GIA library in Carlsbad California, 1 800
421 7250, ext 4088, Elaine Ferrari-Santhom. If they don’t have it
they’ll know where to get it.
Very very friendly and helpful, and absolute goldmine of information
as I found at first hand in the course of researching the gesmtones
series for the Canadian Discovery Channel.