Spong, Ronald C2017-03-062017-03-061992https://hdl.handle.net/11299/184858"Brook Kedron Karst" and "Millet Prairie Karst". 24k USGS topo map containing dye input points, dye vectors and spring where dye was detected. Positive Trace from Last Ditch Drain to Triplet Springs and Graff Springs.enStewartville B 24k USGS DRG Topo MapMap