Soil survey of Porter County, Indiana /
Bushnell, T. M. (Thomas Mark), 1889-
Indiana. Dept. of Geology and Natural Resources.
United States. Bureau of Soils.
Washington :Govt. Print. Office,1918.
At head of title: U.S. Department of Agriculture, Bureau of Soils, in cooperation with the State of Indiana Department of Geology.
"Advance sheets--Field operations of the Bureau of Soils, 1916."
S599.I63 B87 1918
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