背景情報についてはアメリカ合衆国以外の国と地域で公表された著作物の著作権についてをご覧ください。 The 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.
{{Information |Description= Rigi Kulm vor 1920, Aufnahme von Walter Mittelholzer (1894 - 1937) |Source= Die Schweiz von damals, Flugaufnahmen von Walter Mittelholzer, Weltbild-Verlag, Olten 2005 |Date=ca. 1920, upload Dezember 2008 |Author= Walter Mittelh