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								Map DescriptionPhysical Map of North America
 
			Illustrating 
				- 
				Areas above 5,000, 1,600, and 600 feet- Areas below 600 feet
 - Areas below sea-level
 
 Drainage divide
 
 Approximate boundary between the eastern forests and the western 
				prairies and plains.
 
			Credits
 University of Texas at Austin. 
			Historical Atlas by William Shepherd (1911).
 
			
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 More History
 
 
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