The plan of St. Gall
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3, The Plan of St. Gall : a study of the architecture & economy of, & life in a paradigmatic carolingian monastery; appendices / 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