title: Pesticide residues in onions and soil--1969.
mesh_terms: D002849:Chromatography, Gas; D002855:Chromatography, Thin Layer; D003634:DDT / Q000032:analysis; D003633:Dichlorodiphenyl Dichloroethylene / Q000032:analysis; D003632:Dichlorodiphenyldichloroethane / Q000032:analysis; D006540:Herbicides / Q000032:analysis; D007306:Insecticides / Q000032:analysis; D009943:Organophosphorus Compounds; D010573:Pesticide Residues / Q000032:analysis*; D010783:Photometry; D012987:Soil / Q000032:analysis*; D014481:United States; D014675:Vegetables / Q000032:analysis*
chemical_list: D006540:Herbicides; D007306:Insecticides; D009943:Organophosphorus Compounds; D010573:Pesticide Residues; D012987:Soil; D003633:Dichlorodiphenyl Dichloroethylene; D003634:DDT; D003632:Dichlorodiphenyldichloroethane