Groten, Joel T ; Alexander, E. Calvin, Jr https://digitalcommons.usf.edu/sinkhole_2015/ProceedingswithProgram/Upper_Mississippi_Valley_Karst_Aquifers/1.
,
2015
Groten, Joel T ; Alexander, E. Calvin, Jr https://digitalcommons.usf.edu/sinkhole_2015/ProceedingswithProgram/Upper_Mississippi_Valley_Karst_Aquifers/1.
,
2015