hosted by Department of Earth and Planetary Science, Harvard University ; sponsored by Geochemical society ... [et al.]National Aeronautics and Space Administration]1999
[comp. by Lunar and Planetary Instutite ; hosted by Dept. of Planetary Science/Lunar and Planetary Laboratory, and Dept. of Grosciecnes, The University of Arizona ; sponsored by Geochemical society ... [et al.] ; organizers, Michael J. Drake, Joaquin Ruiz]National Aeronautics and Space Administration]1997