title: DDT in watershed draining the tobacco belt of southern Ontario.
mesh_terms: D000821:Animal Feed / Q000032:analysis; D000818:Animals; D002417:Cattle; D003634:DDT / Q000032:analysis*; D005399:Fishes; D005618:Fresh Water / Q000032:analysis; D008460:Meat / Q000032:analysis; D008892:Milk / Q000032:analysis; D009864:Ontario; D010947:Plants, Toxic; D012474:Salmon; D012820:Silage / Q000032:analysis; D012987:Soil / Q000032:analysis; D013997:Time Factors; D014026:Nicotiana; D014877:Water Pollution, Chemical / Q000032:analysis*
chemical_list: D012987:Soil; D003634:DDT