Leff, J.C.: Exotic Art from Ancient and Primitive Civilizations, Collection of Jay C. Leff, Pittsburgh, 1960; Fagg, W.: The Webster Plass Collection of African Art, London, 1953; Lavachery, H.: Art Primitif, Collection J. Van der Straete, Malines, 1956; Wielgus, R.: The Raymond Wielgus Collection, New York, 1960; De Menil, D.: The John and Dominique de Menil Collection, New York, 1962; and one-hundred-twenty-two others of related interest (127)