Conservation / A. B. Costin and H. J. Frith. Costin, A. B. Frith, Harold James, 1921- joint author. Conservation of natural resources Australia. S934.A8 C6 333.72 COC Includes bibliographies. Harmondsworth : Penguin Books, 1971. 1971. 1971 Text 300 p. : eng Pelican books Australia.