I forgot to say in my previous message that one can find a very interesting and complete article on Jean-Marie Ducharme in «Mémoires», vol. 51-1 (# 223), pages 13-22. Likely the last word about Jean-Marie. This article by Helene Lamarche is in French.
Also, available in English as well as in French, the «Dictionary of Canadian Biography online» as many articles on these Ducharme, furs traders and voyageurs in the XVII, XVII and XIX centuries. http://www.biographi.ca/EN/index.htmlhttp://www.biographi.ca/EN/index.html