Keywords: Die Schweiz von damals 1917-1937 (350 historische Flugaufnahmen von Walter Mittelholzer) - Wallisellen 1925.jpg Wallisellen Switzerland aerial photography by Walter Mittelholzer 1894 “1937 Die Schweiz von damals 1917-1937 “ 350 historische Flugaufnahmen von Walter Mittelholzer Weltbild Verlag Olten 2005 1925 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 Wallisellen Aerial photographs of the canton of Zürich Walter Mittelholzer 1925 in Switzerland Scanned with HP Photosmart C6100 |