Jerry Lehman, with a group of other Nafex members, went to Russia to a
region where specialized varieties of plum were cultivated. He documented
the trip with text and video
Somewhere in the Nafex list message archives are posts related to that
project. A Google site: search might find it.
[nafex] Seed and Plant Resources - Lemonary In Bashkortostan,
Lawrence London, 09/05/2022