for junior secondary classes in high schools, technical schools and technical colleges Roberts, Bernard Holton. creator text xna Sydney s. n. 1954 monographic eng

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viii, 184 p. : ill. ; 22 cm. written to conform with the syllabus issued by the Board of Secondary School Studies N.S.W. by B.H. Roberts. Includes index. Physics Juvenile literature Chemistry Juvenile literature 530 ROE BD-RjUL 180114 20211208234604.0 8441 eng