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201Published 2014Subjects: “...Wetland conservation Iowa Iowa Wetland Management District....”
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202by Gardner, James S.Subjects: “...Flood control Social aspects Iowa Iowa River Watershed....”
Published 1973
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203Published 2001Subjects: “...Water quality Iowa....”
Abstract:
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214Published 1930Subjects: “...Agriculture Iowa....”
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215Published 1931Subjects: “...Agriculture Iowa....”
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216Published 1951Subjects: “...Agriculture Iowa....”
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217Published 1979Subjects: “...Phytoplankton Iowa....”
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218Published 1989Subjects: “...Soil conservation Iowa....”
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219by Heinitz, Albert J.Subjects: “...Floods Iowa....”
Published 1986
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220by Soenksen, P. J.Subjects: “...Stream measurements Iowa....”
Published 1990
Government Document Book