Yes that is the map I saw. I am in the NC mountains we had lots of chestnut. I have some chestnut 1x12s, and 2x4s, that I got off an old barn.
Chestnut was widely used around here for log cabins, and for timbers and beams.
They said that in the fall the nuts lay six inches deep beneath the chestnut trees, a feast for deer, bears, and turkeys and hogs.
What a disaster that the chestnut forests were destroyed.
