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เนื้อหาย่อ : MODERN SCIENCE LEVEL TWO HERBERT A. SMITH Director of Teacher Education Colorado State University Fort Collins, Colorado MILO K. BLECHA Professor of Science Education College of Education University of Arizona HERBERT PLESS Science Coordinator Ridley School District Folsom, Pennsylvania Palo Alto, California LAIDLAW BROTHERS PUBLISHERS A Division of Doubleday & Company, Inc. RIVER FOREST, ILLINOIS Dallas, Texas Atlanta, Georgia Toronto Canada