Canadians are indeed coo coo for cmt's. There is a handbook and
a couple of research papers which can be downloaded from the
provincial government archaeology web site.

'Culturally Modified Trees of British Columbia: A Handbook for the
Identification and Recording of Culturally Modified Trees' can be
downloaded from www.archaeology.gov.bc.ca/links.html.

'The Significance and Management of Culturally Modified Trees' and
'Sampling Culturally Modified Tree Sites' can be  downloaded from
www.archaeology.gov.bc.ca/research.html.

Bob Muckle