Draft acid rock drainage technical guide / prepared for the British Columbia Acid Mine Drainage Task Force ... under the Canada/British Columbia Mineral Development Agreement (1985-90) by Steffen Robertson and Kirsten (B.C.) Inc. in association with Norecol Environmental Consultants, Gormely Process Engineering. Victoria : Province of British Columbia, Ministry of Energy, Mines and Petroleum Resources, 1989. 2 v. : ill.