Bacterial Formation of Humus-like Materials from Polychlorinated Biphenyls (PCBs). R.M. Baxter. Page 1

Anaerobic/Aerobic Treatment of Municipal Landfill Leachate. Dhandapani Thirumurthi, Thomas P. Austin, Ramalingaiah, and Sudhir Khakhria. Page 8

Factors Affecting the Recovery of Heavy Minerals from Oilsand Tailings by Flotation. M.J. Ityokumbul, N. Kosaric, W. Bulani and W.L. Cairns. Page 21

Considerations for Network Design for Water Quality and Quantity Surveys in Canada. Edwin D. Ongley. Page 33

The Control of Iron Bacterial Plugging of a Well by Tyndallization Using Hot Water Recycling. D. R. Cullimore and N. Mansuy. Page 50

Studies of the Production of Volatile Fatty Acids in the Anaerobic Digestion of Municipal Sludge. P.H. Jones and J. Szekely. Page 58

Évaluation de la toxicité subléthale des effluents industriels vis-à-vis du poisson en mesurant l'ATP du muscle squelettique. C. Blaise, B. Trottier, R. van Coillie et P. Couture. Page 71

Effects of Bleached Kraft Mill Effluent on Freshwater Fish: A Canadian Perspective. T. Kovacs. Page 91

Microbiological Detoxificaion of Resin Acids. J.A. Servizi, D.W. Martens, R.W. Gordon, J.P. Kutney, M. Singh, E. Dimitriadis, G.M. Hewitt, P.J. Salisbury and L.S. Choi. Page 119

Application of Image Analysis System for Study of Activated Sludge Flocs. Da-hong Li and J. J. Ganczarczyk. Page 130