title: DDT and dieldrin in watersheds draining the tobacco belt of southern Ontario.
mesh_terms: D000388:Air / Q000032:analysis; D000818:Animals; D002417:Cattle; D002849:Chromatography, Gas; D003634:DDT / Q000032:analysis*; D004026:Dieldrin / Q000032:analysis*; D005399:Fishes / Q000378:metabolism; D005618:Fresh Water / Q000032:analysis*; D008460:Meat / Q000032:analysis; D008892:Milk / Q000032:analysis; D009864:Ontario; D010573:Pesticide Residues / Q000032:analysis; D010947:Plants, Toxic; D012820:Silage / Q000032:analysis; D012987:Soil / Q000032:analysis; D014026:Nicotiana / Q000032:analysis; D014867:Water / Q000032:analysis*
chemical_list: D010573:Pesticide Residues; D012987:Soil; D014867:Water; D003634:DDT; D004026:Dieldrin