Eric Wade PetersonUniversity Professor of Geology, Department of Geography, Geology, & the Environment, Illinois StateVerifierad e-postadress på ilstu.edu
John KostelnickIllinois State UniversityVerifierad e-postadress på ilstu.edu
Rex J. RowleyIllinois State University, Department of Geography, Geology, and the EnvironmentVerifierad e-postadress på ilstu.edu