locations on the style and life of the people. Quotations "Der Grenzraum ist das Wirkliche, die Grenzlinie ist das Abstraktion davon" (The borderlands are the reality, the boundary line is an abstraction thereof). (Ratzel, 1895) "A philosophy of the history of the human race, worthy of its name, must begin with the heavens and descend to the earth, must be charged with the conviction that all existence is one—a single conception sustained from beginning to end upon one identical law." "Culture grows in places that can adequately support dense labor populations." Selected bibliography Here are his other notable writings: Wandertage eines Naturforschers (Days of wandering of a student of nature, 1873–74) Vorgeschichte des europäischen Menschen (Prehistory of Europeans, 1875) Die Vereinigten Staaten von Nordamerika (The United States of North America, 1878–80) Die Erde, in 24 Vorträgen (The Earth in 24 lectures, 1881) Völkerkunde (Ethnology, 1885,1886,1888) Politische Geographie, (Political Geography, 1897) Die Erde und das Leben (The Earth and life, 1902) See also Carl Ritter References Sources Further reading Dorpalen, Andreas. The World of General Haushofer. Farrar & Rinehart, Inc., New York: 1984. Martin, Geoffrey J. and Preston E. James. All Possible Worlds. New York, John Wiley and Sons, Inc: 1993. Mattern, Johannes. Geopolitik: Doctrine of National Self-Sufficiency and Empire. The Johns Hopkins Press, Baltimore: 1942. Wanklyn, Harriet. Friedrich Ratzel, a Biographical Memoir and Bibliography. Cambridge, Cambridge University Press: 1961. External links 1844 births 1904 deaths German geographers Geopoliticians Heidelberg University alumni University of Jena alumni Humboldt University of Berlin alumni Academic staff of the Technical University of Munich Human geographers People from Karlsruhe