... von Humboldt to the German diplomat Count Ferdinand von Galen, dated June 21, 1830, are used to explain ..."

... plant in the Ural mountains near Yekaterinburg during his Russian expedition of 1829. The source is a ..."

... werden. Abstract The two attempts (1860 and 1872) to compile a bibliography of all works of Alexander von Humboldt ..."

... more widely. This paper summarizes the topical state of knowledge in this field, and indicates the need ..."