Keywords: Mittelholzer Erlenbach ZH vor 1920.jpg Erlenbach ZH vor 1920 Aufnahme von Walter Mittelholzer 1894 - 1937 Die Schweiz von damals Flugaufnahmen von Walter Mittelholzer Weltbild-Verlag Olten 2005 circa 1920 upload Dezember 2008 Walter Mittelholzer upload by Adrian Michael 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 Walter Mittelholzer Erlenbach ZH Aerial photographs of the canton of Zürich Historical black and white photographs of the canton of Zürich |