TY - BOOK AU - Spencer,Edgar Winston TI - Earth Science: understanding environmental systems SN - 0072341467 (pbk. : acid-free paper) U1 - 550 22 PY - 2003/// CY - Boston PB - McGraw-Hill KW - Earth sciences N1 - Includes index UR - http://www.loc.gov/catdir/description/mh024/2002025073.html UR - http://www.loc.gov/catdir/toc/mh023/2002025073.html ER -