Geology Department University of Puerto Rico at Mayaguez, PO Box 9000, Mayagüez, PR 00681-9000, United States
Department of Geological & Mining Engineering & Sciences Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931, United States
Department of Geological & Mining Engineering & Sciences Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931, United States