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" It is evident from the different stages in the formation and subsequent history of the area of which Pennsylvania is a part that the State may be divided into three natural physiographic provinces, each a part of a much larger province, and each of which... "
Regional and Economic Geography of Pennsylvania: Physiography - Page 9
by Walter Sheldon Tower - 1906 - 69 pages
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The Bulletin of the Geographical Society of Philadelphia, Volume 4

Geography - 1907
...of the various physiographic features as they will be described here. Physiograph ic D ii 'ision s. It is evident from the different stages in the formation...shown on the accompanying relief map (Fig. i), are: (i) The region of the older Appalachians, including the area of the younger brown Triassic sandstone,...
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