W. F. Watts

Control of diesel particulate matter in underground coal mines. Report of Investigations/1989

B. K. Cantrell, K. L. Rubow, K. J. Baumgard, 1989 .

Respirable-dust levels in coal, metal, and nonmetal mines. Information Circular/1987

W. F. Watts, D. R. Parker, 1987 .