Riparian forest buffers in agroecosystems - - lessons learned from the Bear Creek Watershed, central Iowa, USA by Schultz, R.C, Isenhart, T.M, Simpkins, W.W, Colletti, J.P

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Simulating conservative tracers in fractured till under realistic timescales by Helmke, M.F, Simpkins, W.W, Horton, R

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Isotopic composition of precipitation in central Iowa by Simpkins, W.W.

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multiscale investigation of ground water flow at Clear Lake, Iowa by Simpkins, William W.

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Fracture-controlled nitrate and atrazine transport in four Iowa till units by Helmke, M.F, Simpkins, W.W, Horton, R

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Geology, groundwater flow, and water quality in the Walnut Creek Watershed by Eidem, J.M, Simpkins, W.W, Burkart, M.R

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Hydrogeological constraints on riparian buffers for reduction of diffuse pollution: examples from the Bear Creek Watershed in Iowa, USA by SIMPKINS, W. W, WINELAND, T. R, ANDRESS, R. J, JOHNSTON, D. A, CARON, G. C, ISENHART, T. M, SCHULTZ, R. C

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Design and placement of a multi-species riparian buffer strip system by Schultz, R.C. (Iowa State Univ., Ames, IA (USA). Dept. of Forestry), Colletti, J.P, Isenhart, T.M, Simpkins, W.W, Mize, C.W, Thompson, M.L

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Hydrogeology and redox geochemistry of CH4 in a late Wisconsinan till and loess sequence in central Iowa by Simpkins, W.W, Parkin, T.B

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Tributary stream infiltration as a source of herbicides in an alluvial aquifer by Burkart, M.R, Simpkins, W.W, Squillace, P.J, Helmke, M

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Infiltration of atrazine and metabolites from a stream to an alluvial aquifer by Squillace, P.J. (US Geological Survey, Rapid City, SD.), Burkart, M.R, Simpkins, W.W

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Aspects of Growth and Metabolism in a Suspension Culture of Acer pseudoplatanus (L. ) Grown on a Glycerol Carbon Source by GROUT, B. W. W., CHAN, K. W., SIMPKINS, I.

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