Trace elements in plants and soil in relation to cancer.

African Americans Blacks Cadmium/analysis Chromium/analysis Copper/analysis Ethnicity Humans Hydrocarbons/analysis Lead/analysis Lung Neoplasms/epidemiology Nickel/analysis Paranasal Sinus Neoplasms/epidemiology Plants, Toxic Respiratory Tract Neoplasms/epidemiology Soil/analysis South Africa Tobacco/analysis Tobacco, Smokeless/analysis Trace Elements/analysis Zinc/analysis

Hydrocarbons Soil Trace Elements Cadmium Chromium Lead Copper Nickel Zinc