1. The problem of consistent radiological diagnosis in coalminers’ pneumoconiosis;Fletcher;Br J Ind Med,1949
2. Meeting of experts on the International Classification of Radiographs of the Pneumoconioses;Occup Safety Hlth,1959
3. The use of standard films in the radiological diagnosis of coalworkers’ pneumoconiosis;Fletcher;Br J Ind Med,1951
4. The effect of film quality on reading radiographs of simple pneumoconiosis in a trial of x-ray sets;Liddell;Br J Ind Med,1961
5. The classification of chest radiographs for coalworkers’ pneumoconiosis;Ashford;Br J Ind Med,1960