Padilla, Michael J. Prentice hall science explorer : Grade 7 / Michael J. Padilla - New Jersey : Prentice Hall, Inc., c2002. - xxii, 720p. : colored illustrations ; 28 cm. Includes glossary and index ISBN: 013053479x Subjects--Topical Terms: Science. Dewey Class. No.: REF 507.12 P123 2002