The MRC (regional municipal county) of L'Érable is in the region "Centre du Québec" also known as "Bois-Franc"
What you are looking for is the old county (before 1971) I suggest you contact Diane Proulx, coordinator of the Mauricie-Bois-Francs GenWeb at
http://www.rootsweb.com/~onmauric/index.htmor if your ancestors are anglo-protestant, contact
Pam Wood, coordinator of Eastern Townships GenWeb at
http://www.geocities.com/Heartland/Acres/3500/et.htmlRoger