. "Verstraeten, I. M. (Ingrid Maria)" . . . . . . "Interaction of surface water and ground water in the Dutch Flats area, western Nebraska, 1995-99" . . . "Selected field and analytical methods and analytical results in the Dutch Flats area, western Nebraska, 1995-99" . . . "Verstraeten, I. M. (Ingrid Maria) Hydrogeology and subsurface nitrate in the Upper Big Blue Natural Resources District, Central Nebraska, July 1995 through September 1997" . . . "Verstraeten, I. M. (Ingrid Maria) Selected surface-water, ground-water, and tracer data from the Elkhorn and Platte rivers and the alluvium near Ashland, eastern Nebraska, 1991-97" .