1. Environmental Research Institute of Michigan, Arlington, Virginia 22209
2. Massachusetts Institute of Technology, Lexington, Massachusetts 02173
3. The Aerospace Corporation, Los Angeles, California 90009-2970
4. U.S. Army Space and Strategic Defense Command, Huntsville, Alabama 35807-3801
5. General Research Corporation, Danvers, Massachusetts 01923
6. Visidyne, Burlington, Massachusetts 01803