Page is updated as information becomes available.

 

“Tree Decay: An Expanded Concept”, Agriculture Information Bulletin Number 419, April 1979, Alex L. Shigo. Illustrations by David M. Carroll  http://na.fs.fed.us/spfo/pubs/misc/treedecay/page1.htm

 

“Compartmentalization of Decay in Trees” (CODIT) Agriculture Information Bulletin Number 405. Shigo, Alex L., Marx, Harold G. Drawings by David M. Carroll. 1977 http://www.treesearch.fs.fed.us/pubs/5292

 

“Tapholes in sugar maples: What happens in the tree”, General Technical Report NE-47. Walters, Russell S., Shigo Alex L. 1978  http://www.nrs.fs.fed.us/pubs/6205