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Ours soils and their management : increasing production through environmental soil and water conservation
Published 1976“…The Interstate ,…”
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3
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The story of water pollution control
Published 1958“…Interstate Commission on the Potomac River Basin ,…”
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5
Report on soil conservation and watershed management studies
Published 1967“…Secretary Interstate Soil Conservation Board ,…”
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6
A clean potomac river in the Washington metropolitan area
Published 1957“…Interstate Commission on the Potomac River Basin ,…”
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