2005. Peterson, Todd A. Map showing the susceptibility of ground water in the upper most bedrock aquifers to contamination, including the age of the water as determined fr... Minnesota Department of Natural Resources, Division of Waters.
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2005. Peterson, Todd A. Maps showing ground water resources and aquifer characteristics in the bedrock and unconsolidated sediments overlying the bedrock, including the ag... Minnesota Department of Natural Resources, Division of Waters.
2005. Peterson, Todd A. Cross sections detailing how and when ground water moves through the bedrock and Quaternary (unconsolidated glacial and stream sediment overlying t... Minnesota Department of Natural Resources, Division of Waters.