North American Fruit Explorers mailing list at ibiblio

["Randall Burd" <burdrs@comcast.net>]

You can also try: http://www.grimonut.com. While I haven't ordered from
them, I looked into the whoe pine nut tree thing a few years ago. There
is a short discussion of this in the old Rosalind Creasy book "Edible
Landscaping" that is not very encouraging for the home or small scale
operation.