Source: Perspective on the nature of geography (1958), p. 47
“The unique purpose of geography is to seek comprehension of the variable character of areas in terms of all the interrelated features which together form that variable character.”
Source: Perspective on the nature of geography (1958), p. 20
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Richard Hartshorne 18
American Geographer 1899–1992Related quotes
Source: Perspective on the nature of geography (1958), p. 21
Charles Perrow (1967), in: Industrial Relations Research Association, Proceedings of the ... Annual Winter Meeting, Vol. 19 (1967), p. 163
1960s

Lectures XI, XII, and XIII, "Saintliness"
1900s, The Varieties of Religious Experience (1902)

Variant: A linguistic variable is defined as a variable whose values are sentences in a natural or artificial language.
Source: 1970s, Outline of a new approach to the analysis of complex systems and decision processes (1973), p. 28

On the Hypotheses which lie at the Bases of Geometry (1873)

Tobin, James. " Estimation of relationships for limited dependent variables http://cowles.econ.yale.edu/P/cp/p01a/p0117.pdf." Econometrica: journal of the Econometric Society (1958): 24-36.
1950s-60s