Publications
• ''Workers' education in England & the United States'', London, K. Paul, Trench, Trubner & Co. 1925. • Change and history : a study of the dated distributions of technological innovations in England, New York, Johnson 1952. • Early Anthropology in the Sixteenth and Seventeenth Centuries, Philadelphia, Pa University of Pennsylvania Press 1964. • Anthropology, history, and cultural change, Tucson, University of Arizona Press 1974. ==References==