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Water samples were collected in the St. Lawrence River and at the mouths of four major tributaries, the Richelieu, the Yamaska, the St. Francois and the Nicolet, between August 1990 and November 1991. Analyses were done forp,p -DDT, o,p -DDT, p,p -DDE, p,p -DDD and o,p -DDD. In the St. Lawrence River, the highest mean (x = 3.02 ng/l) was measured in April, during the period of spring thaw,...