found: Work cat.: Marache, M. Les métamorphoses du rural: l'exemple de la Double en Périgord (1830-1939), 2006:p. 25 (Historically, the Double forest extended from Barbezieux, in Charente, as far as the Vergt region in Dordogne. Today, the "Double" lies principally in Dordogne, but there is also a Double girondine, partly formed by the mouths of the rivers Dronne and Isle, and a Double saintongeaise, to the north of the Dronne valley.), p.26 (Forested plateaus, coombs, ravines and valleys: the landscape's characteristics.)
