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To the Editor:—
The description of "focal emphysema" as a distinct pathological entity in coal workers is associated with the Welsh National School of Medicine. The existence of this form of emphysema, characteristic of the simple dust lesion in coal workers, has been confirmed by a number of pathologists in different countries. Your correspondents, Drs. Mayer, Rappaport, and Schepers (J. A. M. A.160:230 [Jan. 21] 1956), are the only ones we have encountered who have misinterpreted our descriptions (Gough, J.: J. Path. [unk] Bact.51:277, 1940; Report of Advisory Committee on Treatment and Rehabilitation of Miners in Wales Region Suffering from Pneumoconiosis, London, His Majesty's Stationery Office, 1944, p. 17; Occup. Med.4:86, 1947. Heppleston, A. G.: J. Path. [unk] Bact.59:453, 1947; A. M. A. Arch. Indust. Hyg.4:270 [Sept.] 1951; J. Path. [unk] Bact.66:235, 1953; ibid. 67:51, 1954) and
Gough J, Heppleston AG. FOCAL EMPHYSEMA. JAMA. 1956;162(2):135–136. doi:10.1001/jama.1956.02970190051016
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