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Kerkmann, Willi Deutsche Kameras 1945-1999, 3th Edition, 1999. Germany, Willi Kerkmann, 1999. ISBN 3-00-004635-6 (softcover).
Kerkmann, Willi Deutsche Kameras 1945-1999, 3th Edition, 1999. Germany, Willi Kerkmann, 1999. ISBN 3-00-004635-6 (softcover).