Please excuse this off topic post but I think some might find it of interest.
Through generosity of friends, I have acquired an extra copy of the 2006 BCSS publication. "Ariocarpus et. cetera" by John Philbeam and Bill Weightman.
It is a beautiful and informative book on the smaller genera of Mexican cacti.
Cover price from BCSS is just over $80.00 US.
I will sell it postage paid to anywhere in the USA for $45.00.
If interested, please PM me. Don't bother the list further.
