Text ( visual ) : unmediated Lunar and planetary science XXI : abstracts of papers submitted to the twenty-first Lunar and Planetary Science Conference, March 12-16, 1990 / compiled by the Lunar and Planetary Institute. -- pt. 1 : A-Ha ; pt. 2 : He-Pa ; pt. 3 : Pe-Z ; pt. [4] : PRESS ABSTRACTS. -- Houston : Lunar and Planetary Institute , [1990]. -- 3 v. : ill. ; 28 cm. -- Includes bibliographical references and indexes ; Sponsored by: Lunar and Planetary Institute NASA/Johnson Space Center, American Association of Petroleum Geologists, American Geophysical Union, Division for Planetary Science of the American Astronomical Society, Geological Society of America, International Union of Geological Sciences, Meteoritical Society. -- (BA11425570) ; https://ci.nii.ac.jp/ncid/BA11425570 Author Heading(s): Lunar and Planetary Science Conference ; United States. National Aeronautics and Space Administration ; Lunar and Planetary Institute ; Lyndon B. Johnson Space Center. -- Classification(s): LCC : QB592 ; DC : 559.9/1