“Staldsen Switzerland”: an episode from the history of nature conservation in East Prussia in the first third of the 20th century
... cultural monuments, participated in correspondence devoted to nature conservation. The originals of the published letters are preserved in the Federal Archives of Germany in Koblenz.
Walter Schoenichen, Richard Dethlefsen, nature conservation, protected area, East Prussia
45-58
10.5922/vestnikhum-2026-1-4
