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Lentz, Rodrick D. and Sojka, Robert E. and Kincaid, Dennis C. (1998) Design and calibration of percolation samplers for measuring polyacrylamide-amended furrow-irrigation effects on drainage water quality. pp. 267-276. In: Proc. of the Seventh International Drainage Symposium. Drainage in the 21st Century: Food Production and the Environment. USA-FL-Orlando, 1998/03/08-10. ASAE, St. Joseph, MI.