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2by Tolley, G. S., Riggs, F. E., Iowa State University, Symposium on the Economics of Watershed Planning June 1959:
Published c196Texto bibliotecaUBA FA -
3by 124779 Tolley, G.S., 110755 Riggs, F.E. eds, Symposium on the Economics of Watershed Planning Knoxville, TN (EUA) Jun 1959
Published 1961bibliotecaIICA -
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