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5by Burckhardt, Walther, 1871-1939“...Helbing & Lichtenhahn,...”
Published 1927
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7by Lötscher, Valentin, 1916-, Lötscher, Valentin, 1916-1984, Lötscher, Valentin, 1916-1984, Lötscher, Valentin, 1916-1984“...Helbing Lichtenhahn,...”
Published 1943
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