1. California Institute of Technology, Pasadena 91109
2. Kitt Peak National Observatory, Tucson, Arizona 85717
3. Jet Propulsion Laboratory, Pasadena, California 91109
4. Rand Corporation, Santa Monica, Californtia 90401
5. Ames Research Center, Moffett Field, California 94035
6. University of Pittsburgh, Pittsburgh, Pennsylvania 15260
7. Hampshire College, Amherst, Massachusetts 01002
8. University of Arizona, Tucson 85726
9. University of Wisconsin, Madison 53706
10. U.S. Geological Survey, Reston, Virginia 22092