British Columbia. Pollution Control Branch & Parsons, D. (1975). Health aspects of sewage effluent irrigation. Pollution Control Branch, British Columbia Water Resources Service, Dept. of Lands, Forests, and Water Resources.

British Columbia. Pollution Control Branch and D. Parsons. Health Aspects of Sewage Effluent Irrigation. Victoria: Pollution Control Branch, British Columbia Water Resources Service, Dept. of Lands, Forests, and Water Resources, 1975.

British Columbia. Pollution Control Branch and D. Parsons. Health Aspects of Sewage Effluent Irrigation. Pollution Control Branch, British Columbia Water Resources Service, Dept. of Lands, Forests, and Water Resources, 1975.