Keywords: Die Schweiz von damals 1917-1937 (350 historische Flugaufnahmen von Walter Mittelholzer) - Pfäffikon 1920.jpg Pfäffikon Switzerland aerial photography by Walter Mittelholzer 1894 “1937 Die Schweiz von damals 1917-1937 “ 350 historische Flugaufnahmen von Walter Mittelholzer Weltbild Verlag Olten 2005 1920 Walter Mittelholzer upload by Roland zh PD-old Swiss copyright on Mittelholzer's work's expired at the end of 1987 since Switzerland had a copyright term of 50 years p m a until 1993 and the extension to 70 years p m a made in 1993 did not restore already expired copyrights Files by User Roland zh Aerial photographs of the canton of Zürich Walter Mittelholzer 1920 in Switzerland Pfäffikersee Pfäffikon ZH Scanned with HP Photosmart C6100 |