Ross Dowson was a central leader of Canadian Trotskyism for many years. There is a website devoted to his archives at http://rossdowson.com/.
Within the correspondence posted on the site, there are a number of items that concern the International Marxist Group.
His assessment of the 1971 IMG conference debates is here
http://rossdowson.com/corr/1971/1971-EU-06June23.html
A letter to Pat Jordan regarding the Turin Workers Conference organised is Fourth International is at:
There are other letters that from his correspondence with leaders of the IMG minority such as Connie Harris and with leaders of the US SWP.
Red Mole Rising 
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