Bonn, 1974 83pp. + 9 large folding plates loosse in rear pocket, 21cm., text in German, Doctoral dissertation (Inaugural-Dissertation zur Erlangung des Doktorgrades der Hohen Mathem.-Naturw. Fakultät der Rheinischen Friedrich-Wilhelms-Universität zu Bonn), stamp at verso of title page, softcover, text is clean and bright, X110788