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© 2013 Urs Oskar Keller, as well as Pro Litteris, Zürich, www.urs-ok.ch
Pictures and texts are copyright protected. Reproduction permitted only by written permission from Urs Oskar Keller.
With kind thanks several photos originate from Uwe Brügmann, Alois Corinthio, Simone Jetwilayties,
Venla Rosa D. Keller, Barbara Rüttimann Haueter, Bernadette S. Straessle and Rolf Wessendorf.
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