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Ritter's masterwork, the 19-volume Die Erdkunde im Verhältniss zur Natur und zur Geschichte des Menschen (The Science of the Earth in Relation to Nature and the History of Mankind), written 1817-1859, developed at prodigious length the theme of the influence of the physical environment on human activity. Despite its length, the work was left incomplete at the time of his death, covering only Asia and Africa.