Tobacco chewing in english coal miners. A preliminary report.
D000539:Alveolar Process / Q000473:pathology; D001706:Biopsy; D004739:England; D006801:Humans; D007642:Keratosis / Q000473:pathology; D007972:Leukoplakia, Oral; D008297:Male; D008409:Mastication; D008875:Middle Aged; D008906:Mining; D009061:Mouth Mucosa / Q000473:pathology; D010947:Plants, Toxic; D012907:Smoking; D014026:Nicotiana