Bourgon, M. (1937). Contribution à l’Étude du Quaternaire en Périgord Noir. Bulletin de la Société Historique et Archéologique du Périgord, LXIV, 251–257.
Essay on the chronology and local prehistoric industries. Provides site names, small geologic description, the types of deposits as well as their date and the type of sediment they were found in. Mentions la Ferrassie and identifies the tools as Tayacien.