1. Physical Sciences Inc., 20 New England Business Center, Andover, MA
2. Phillips Laboratory, Hanscom AFB, MA 01731
3. Space Sciences Laboratory, U. California, Berkeley, CA 94720
4. Lockheed Martin Palo Alto Research Lab., 3251 Hanover St., Palo Alto, CA 94304
5. Geophysical Institute, 903 Koyukuk Dr., Fairbanks, AK 99775