title: Pneumoconiosis and tractor ploughing.
authors.forename: H
authors.initials: H
authors.lastname: Dubovsky
mesh_terms: D000328:Adult; D000382:Agricultural Workers' Diseases / Q000175:diagnosis / Q000209:etiology*; D004391:Dust / Q000009:adverse effects; D006801:Humans; D008875:Middle Aged; D011009:Pneumoconiosis / Q000175:diagnosis / Q000209:etiology*; D012987:Soil
chemical_list: D004391:Dust; D012987:Soil