Special sessions: Early Lunar Cratering and the Impact Chronology of the Terrestrial Planets, and Odyssey "Mars--We're Back!" Contains the preface, table of contents, program, abstracts and indexes for the 33rd Lunar Planetary Conference.sponsors, National Aeronautics and Space Administration, Lunar and Planetary Institute, NASA Johnson Space CenterThe program committee was co-chaired by Carl Agee and David Black.PARTIAL CONTENTS: Olivines in Lherzolitic Shergottite ALH77005: Inclusions and Geochronology / J. Edmunson, L.E. Borg, C.K. Shearer, and J.J. Papike--New Data and Search Features in the NASA ADS Abstract Service / G. Eichhorn, A. Accomazzi, C.S. Grant, M.J. Kurtz, V. Rey Bacaicoa, and S.S. Murray--A Transparent, Very Hard, Dense an...