TY - BOOK ED - National Wildlife Federation. TI - Pollution: problems & solutions T2 - Ranger Rick's naturescope SN - 0791048829 AV - TD176 .P657 1999 U1 - 363.73 21 PY - 1999/// CY - Philadelphia PB - Chelsea House KW - Pollution KW - Study and teaching (Elementary) KW - Activity programs KW - Study and teaching KW - sears N1 - Includes bibliographical references (p. 106-108) and index; Science Books & Films (A.A.A.S.); Professional; Follett Library Resources N2 - Text and activities introduce pollution, its causes and effects, and ways to prevent it ER -