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This article says that Dupuis led the Parti presidentiel from 1973 to 1974, while the Union Nationale article says that he lead that party from 1973-76. The latter article is supported by geniesenherbe.org. It seems likely that the Wikipeida article is written from this website in the first place. Any ideas on how to resolve this?
The following references confirm the Dupuis article version (that he was the head of the RCQ), not the Union Nationale article version (that he was head of the UN): 
Even geniesehherbe says that he was leader of RCQ 73-74, so it seems to contradict itself, so I think it is the source of the problem. Kevintoronto 22:51, 2 Mar 2005 (UTC)
I have taken him off the UN page because the French version of the UN article does not have him as leader. Kevintoronto 20:30, 4 Mar 2005 (UTC)