All Things Considered, May 19, 2006 � Experts have
confirmed that a cluster of trees found by a scientist
hiking near Pine Mountain, Ga., are in fact American
chestnut trees. But researchers say they have no idea
how the trees escaped a blight in the early 1900s,
which scientists thought had wiped out the entire
U.S. population of the trees.

Biologists have been attempting to restore the tree
for 15 years by referring to hardier Asian and European
strains. Melissa Block talks with Nathan Klaus, a senior
wildlife biologist with the Georgia Department of
Natural Resources.

Don't know how long this link will be good for.

http://www.npr.org/templates/story/story.php?storyId=5418829