CONCEPTS IN SCIENCE, GRADE 4, CURIE EDITION - BRANDWEIN, PAUL; COOPER, ELIZABETH; BLACKWOOD, PAUL; COTTOM-WINSLOW, MARGARET; ABOESCHEN, JOHN; GIDDINGS, MORSLEY; ROMERO, FRANK; CARIN, ARTHUR (HARCOURT BRACE JOVANOVICH NEW YORK, 1980)
Keywords: SCIENCE; EDUCATION; SOUND; LIGHT; WATER; AIR; SOIL; TREES; JOURNEYS OF SALMON AND DUCK; ENVIRONMENT