[1] US GEOL SURVEY,FLAGSTAFF,AZ 86001
[2] NEW MEXICO STATE UNIV,LAS CRUCES,NM 88003
[3] CALTECH,JET PROP LAB,PASADENA,CA 91109
[4] NASA,WASHINGTON,DC 20546
[5] CTR ASTROPHYS,CAMBRIDGE,MA 02138
[6] NASA,AMES RES CTR,MOFFETT FIELD,CA 94035
[7] CALTECH,PASADENA,CA 91125
[8] RAND CORP,SANTA MONICA,CA 90406
[9] UNIV LONDON IMPERIAL COLL SCI & TECHNOL,LONDON SW7 2AZ,ENGLAND
[10] UNIV WISCONSIN,MADISON,WI 53706
[11] UNIV HAWAII,HONOLULU,HI 96822
[12] SUNY STONY BROOK,STONY BROOK,NY 11794
[13] CORNELL UNIV,ITHACA,NY 14853