Bochum, 1975 [6] + 153pp., with illustrations in text, + 2 large folding maps loosely inserted in rear pocket, 21cm., Doctoral Dissertation (Dissertation zur Erlangung des Grades eines Doktors der Naturwissenschaften der Abteilung Geowissenschaften an der Ruhr-Universität Bochum), original softcover, stamp at verso of title page, text is clean and bright, good condition, W112338