1. U.S. Geological Survey; Flagstaff Arizona USA
2. Department of Astronomy; Cornell University; Ithaca New York USA
3. Lowell Observatory; Flagstaff Arizona USA
4. Department of Earth and Planetary Sciences; Washington University; St. Louis Missouri USA
5. Department of Geological Sciences; Arizona State University; Tempe Arizona USA
6. Johnson Space Center; Houston Texas USA
7. Department of Geography and Geosciences; Bloomsburg University; Bloomsburg Pennsylvania USA