Smith, Herbert A. Science 4 / [electronic resource] / Herbert A. Smith, Milo K. Blecha, John Sternig.. — 2nd ed.. — River Forest, Ill. : : Laidlaw Bros.,, c1966.. — 288 p. : : col. ill. ; 24 cm. — (Laidlaw science series). Includes index. Subjects--Topical Terms: Science--Study and teaching (Elementary)