"The area prior to the introduction of man 's activity is represented by one body of morphologic facts. The forms that man has introduced are another set. We may call the former, with reference to man, the original, natural landscape. In its entirety it no longer exists in many parts of the world, but its reconstruction and understanding are the first part of formal morphonology." Carl O. Sauer, "The Morphology of Landscape". University of California Publications in Geography, vol. 2, No. 2, 12 October 1925, p. 37.[1]
