An approach to Holocene vegetation history in the middle Rhone valley (France): anthracological data from the "TVG-Méditerranée" excavations - Delhon, C. (Charcoals from the Past. Cultural and Palaeoenvironmental Implications. Proceedings of the Third International Meeting of Anthracology, Cavallino - Lecce (Italy), June 28th - July 1st 2004., 2008)