1. Department of Geological Sciences, Brown University, Providence, Rhode Island 02912
2. Institut für Geophysik, University of Kiel, Federal Republic of Germany, and Science Applications, Inc., Pasadena, California 91101
3. Flight Instrumentation Division, NASA Langley Research Center, Hampton, Virginia 23665
4. Department of Genetics, School of Medicine, Stanford University, Stanford, California 94305
5. Department of Genetics, School of Medicine, Stanford University
6. Branch of Astrogeologic Studies, U.S. Geological Survey, Flagstaff, Arizona 86001
7. Division of Engineering, Brown University
8. Space Science Division, Ames Research Center, Moffett Field, California 94305
9. Laboratory for Planetary Studies, Cornell University, Ithaca, New York
10. Viking Project Office, NASA Langley Research Center