DE BARRADAS, J.P.: Orfebreria Prehispanica de Colombia, 3 Volumes, Madrid, 1954-66; Hartman, C.V.: Archeological Researches on The Pacific Coast of Costa Rica, Pittsburgh, 1907; A Short Guide to the American Antiquities in the British Museum, London, 1912; Art Précolombien, auction catalogue, Paris, 20 & 21 December 1927; Pre-Columbian Pottery, Gold & Silver and Stone Sculptures... Property of James Arthur Ewing, Parke-Bernet Galleries, New York, 7 January 1960; and 31 other publications of similar interest (38)