Alexander, E. C., Jr.Berner, David J.Falteisek, JanGao, YongliGreen, Jeffrey A.Maps showing distribution of karst (carbonate rock with caves, springs) units and features and karst hydrology in carbonate rocks susceptible to being dissolved by acidic ground water, scale 1:100000, Goodhue County.PDFengMinnesota Department of Natural Resources, Division of WatersPublicGeologic atlas of Goodhue County, Minnesota, C-12, Part B, Plate 10, Sinkholes, Sinkhole Probability, and Springs and SeepsMapsMinnesota2003University of Minnesota