by Walter Horn and Ernest Born ; with a foreword by Wolfgang Braunfels ; a translation into English by Charles W. Jones of the Directives of Adalhard, 753-826, the Ninth Abbot of Corbie ; and with a note by A. Hunter Dupree on the Significance of the Plan of St. Gall to the history of measurement ; set - v. 3. -- University of California Press, 1979. -- (California studies in the history of art ; 19).