Carcinogens/adverse effects; Neoplasms/chemically induced; Occupational Diseases/chemically induced; Pesticides/adverse effects; Animals; Arsenicals/adverse effects; Breast Neoplasms/chemically induced; Breast Neoplasms/epidemiology; Causality; Chlordan/adverse effects; Creosote/adverse effects; DDT/adverse effects; Ditiocarb/adverse effects; Ditiocarb/analogs & derivatives; Female; Herbicides/adverse effects; Hexachlorocyclohexane/adverse effects; Humans; Insecticides/adverse effects; Leukemia/chemically induced; Leukemia/epidemiology; Lung Neoplasms/chemically induced; Lung Neoplasms/epidemiology; Lymphoma/chemically induced; Lymphoma/epidemiology; Lymphoma, Non-Hodgkin/chemically induced; Lymphoma, Non-Hodgkin/epidemiology; Mutagens/adverse effects; Neoplasms/epidemiology; Neoplasms, Experimental/chemically induced; Occupational Diseases/epidemiology; Occupational Exposure; Ovarian Neoplasms/chemically induced; Ovarian Neoplasms/epidemiology; Phenols/adverse effects; Protective Devices; Sarcoma/chemically induced; Sarcoma/epidemiology; Triazines