Groundwater quality response to closure of agricultural drainage wells in Floyd County, Iowa, L. S. Seigley, D. J. Quade, and M. P. Skopec, 1999, 82 p., 25 figs., 8 tables, 4 appendices. The Technical Information Series presents research results on a wide variety of geological studies. As its name implies, the series requires that the reader have some background in geologic concepts and terminology.