![](http://www.alamy.com/thumbs/6/B891A3AE-573E-481A-935C-43E1F2A0E1D8/MCKNWH.jpg)
. Fig. 15.—Moisture zonation of the eastern United States, according to precipitation-evaporation ratio (annual), after Transeau.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphytoge, bookyear1921