^Kaplan et al. (2004), p. 4. "The first half of the 20th century saw the gradual emergence of the field of urban geography, which was based on several fundamental concepts developed by a limited number of scholars. The first courses in urban geography were not taught until the 1940s (by Chauncy Harris, the father of urban geography, at Indiana University and by Edward Ullman at Harvard University)> The second half of the 20th century then witnessed the development of urban geography as a major substantive subdiscipline in geography. At the dawn of the 21st century, only the technical field of geographic information sciences had more members in the leading and largest professional geography society, the Association of American Geographers (AAG) than the urban geography group did."
^G.M. Lappo & N.V. Petrov,Urban Geography in the Soviet Union and the United States; Lanham, Maryland: Rowman & Littlefield, 1992;ISBN0-8476-7568-8; pp. 15–20.
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