Delimiting the Main Line District of Philadelphia

NE of the greatest difficulties in discussing geographic regions is that of accurately and logically confining the area to definite boundaries. Limits of regions are too often arbitrary and poorly defined. Frequently there are good reasons for using an indefinite boundary, but study and description are always facilitated if it is possible to draw exactly the limits of the area in question. This study attempts to present a simple method of logically bounding a somewhat indefinite region. The region used for illustration is one that exists

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