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Atlas of the Historical Geography of the United States
Here you will find one of the greatest historical atlases: Charles O. Paullin and John K. Wright's Atlas of the Historical Geography of the United States, first published in 1932. This digital edition reproduces all of the atlas's nearly 700 maps. Many of these beautiful maps are enhanced here in ways impossible in print, animated to show change over time or made clickable to view the underlying data.
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Historical Soil Survey Maps - University of Alabama
This is a collection of 1,612 Soil Survey Maps produced from 1899 to 1950 by the U.S Department of Agriculture. For all 50 states and Puerto Rico.