1. Das Riesengebirge nebst Waldenburg, Grafschaft Glatz und den böhmischen Sudeten Creator: Proehle, Heinrich Publisher: Goldschmidt Type: model:monograph and TEXT Language: German Rights: http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
2. Der Harz Creator: Proehle, Heinrich Publisher: Goldschmidt Type: model:monograph and TEXT Language: German Rights: http://creativecommons.org/publicdomain/mark/1.0/ and policy:public