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THE GRASSLAND OF NORTH AMERICA
Factors in grassland equilibrium
Science and social theory
12 other sections not shown
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agriculture Amer American animals arid Arkansas river blue grama bluestem boundary Brazos buffalo grass Bull cattle century chernozem Clements climate concept conclusions corn crop culture desert distribution dominant drouth east eastern Ecol Ecology emphasized environment erosion fact factors farm farmers fertility forest frontier Geog geographical geological grama grama grass grassland growth high plains Hilgard Ibid idea Important Inches Indian irrigation Jour Kansas land Marcy ment meridian mesquite methods Mississippi moisture mountain mulch natural Nebraska North America northern numbers period plant plow population prairie prairie dog present problem production rainfall range region relation river Shantz short grass significant social soil soil science soli sorghums South Dakota southern Southern Great Plains species tall grass Texas theory tillage timber tion trees United USDA vegetation western westward winter wheat York