sponsored by NASA Office of Space Science and held at the University of Chicago, January 19-21, 1978 ; editors, David Morrison, NASA, Office of Space Science, William C. Wells, Science Applications, inc. ; co-chairmen, Edward Anders, University of Chicago, David Morrison, NASA, Office of Space Science
sponsored by NASA Office of Space Science and held at the Goddard Space Flight Center, Greenbelt, Maryland, October 1977 ; editors, M. Neugebauer ... [and others]