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The Shenandoah Valley frontier
Mitchell, Robert D., (1972)
Economic strategies for beef cattle production applied to the Shenandoah Area of Virginia
Chiang, Ying-Chih, (1973)
Economic and Social Beginnings of Michigan : A Study of the Settlement of the Lower Peninsula During the Territorial Period 1805-1837
Fuller, George Newman, (1916)
The Road to Quality Traveled by the TVA's Environmental Research Center
Radel, Robert J., (1994)