title: CHANGES IN THE PREVALENCE OF COALWORKERS' PNEUMOCONIOSIS AMONG MINERS AND EX-MINERS IN THE RHONDDA FACH 1951-61.
mesh_terms: D055008:Anthracosis; D001699:Biometry; D003032:Coal Mining; D006801:Humans; D011009:Pneumoconiosis; D015995:Prevalence; D013223:Statistics as Topic; D014852:Wales
keywords: COAL MINING; PNEUMOCONIOSIS; STATISTICS; WALES