[Determination of nitrates and nitrites in well water from Yaocun commune, Linxien County, Henan province (author's transl)].
D002681:China; D004938:Esophageal Neoplasms / Q000453:epidemiology; D006801:Humans; D009566:Nitrates / Q000032:analysis*; D009573:Nitrites / Q000032:analysis*; D012621:Seasons; D014881:Water Supply / Q000032:analysis*
D009566:Nitrates; D009573:Nitrites