International conference on heavy metals in the environment, symposium proceedings, held at Toronto, October 1975: Edited by T.C. Hutchinson. Vol. 1, Plenary, Analytical and Regulatory Papers; Vol. 2, Pathways and Cycling; Vol. 3, Health Effects. Institute of Environmental Studies, Haultain Building, University of Toronto. 1977. Vol. 1: pp. 371, Vol. 2: pp. 1045, Vol. 3: pp. 405. Price: $50·00 for three volumes.