Humboldt, Alexander von - Autograph Letter Signed 1812 _more shown in William Tell

shown in William Tell

WATCH LEONID KOGAN PERFORMING

Argentine soprano (1896-1969)

with Cornelis Dopper at the podium

who was one of the students of Otakar Sevcik

Humboldt, Alexander von - Autograph Letter Signed 1812 _more shown in William TellGerman geographer, naturalist and explorer (1769 1859), who made very significant contributions to several fields of science including botany, zoology and geophysics. After 5 years (from 1799 through 1804) of travelling through Latin America, Humboldt published a series of large volumes with valuable information, later was the first to propose that humans were changing the world climate. Autograph letter signed, to British writer Helen Maria Williams