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Journal of Occupational Medicine. : Official Publication of the Industrial Medical Association|August 1, 1986
Sputum cytopathology: use and potential in monitoring the workplace environment by screening for biological effects of exposureJ K Frost, W C Ball, M L Levin, et al.The Johns Hopkins Medical Journal|September 11, 1975
A genetic-epidemiologic study of chronic obstructive pulmonary disease. I. Study design and preliminary observationsB H Cohen, W C Ball, W B Bias, et al.Pageof 2