1. Colorado School of MinesCenter for Gravity Electrical and Magnetic Studies 1500 Illinois, st., Golden 13593 Berlin Germany
2. XRI Geophysics 14828 3B W. 6th Ave Golden 80401 CO USA
3. New England DistrictUS Army Corps of Engineers 696 Virginia Road MA 01742 Concord USA
4. Colorado School of MinesDepartment of GeophysicsCenter for Gravity Electrical and Magnetic Studies 1500 Illinois, st., Golden 80401 CO USA
5. QTRS Holdings LLC 1208 Washington St MS 39180 Vicksburg USA