Bonn, 1972 199pp. with some ills. + 3 folding plates/maps loose in rear pocket, 21cm., text in English, Doctoral dissertation (Thesis submitted for the Degree Doctor of the Hohen Mathem.-Naturw. Fakultät of Rheinischen Friedrich-Wilhelms-Universität zu Bonn), stamp at verso of title page, softcover, text is clean and bright, good condition, C110839