Tác giả: Michael J. Armstrong

Steven A. Walton is Associate Professor of History at Michigan Technological University. He is the author and editor of several books, including Wind & Water in the Middle Ages: Fluid Technologies from Antiquity to the Renaissance. Michael J. Armstrong is retired Senior Vice President of Operations for U.S. News & World Report and former President of the Chapel Restoration, Wharton”s first architectural commission, in Cold Spring, New York.