Dwight Waldo (1978), "Organization Theory: Revisiting the Elephant," Public Administration Review, 38 (November/December): p. 589
“Although the roots of geography, as a field of study, reach back to Classical Antiquity… its establishment as a modern science was essentially the work of the century from 1750 to 1850. The second half of this period, the time of Humboldt and Ritter, is commonly spoken of as the "classical period" of geography.”
Source: The Nature of Geography (1939), p. 35
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Richard Hartshorne 18
American Geographer 1899–1992Related quotes
Hartshorne (1958) "The concept of geography as a science of space, from Kant and Humboldt to Hettner" in: Annals of the Association of American Geographers Vol 48 (2). p. 97

This quotation is useful for explanations of the period of art nouveau, and the causes of the art movement.
Confession d'un Enfant du Siécle (1836)(translation)
R. Hartshorne (1935) "Recent Developments in Political Geography" The American Political Science Review Vol. 29 (5), p. 585

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Source: The Nature of Geography (1939), p. 22 Introduction: About the historical background of American Geography
Source: The Corporate Revolution in America, 1957, p. 287