https://www.na.fs.fed.us/spfo/pubs/fidls/oakwilt/oakwilt.htm
http://hort.uwex.edu/articles/oak-wilt/
https://www.extension.umn.edu/environment/trees-woodlands/oak-wilt-in-minnesota/

https://www.na.fs.fed.us/spfo/pubs/fidls/oakwilt/oakwilt.htm
http://hort.uwex.edu/articles/oak-wilt/
https://www.extension.umn.edu/environment/trees-woodlands/oak-wilt-in-minnesota/