P. L. Michael

Evaluation of experimental and developmental communication systems used in underground coal mines. Performance of trapped-miner communication system. Final report, 1 April 1976--31 January 1977

P. L. Michael, J. H. Prout, 1977 .

Aspects of noise generation and hearing protection in underground coal mines. Final report

Lee W. Saperstein, P. L. Michael, James H. Prout, 1972 .

A Study of Roof Warning Signals and the Use of Personal Hearing Protection in Underground Coal Mines

Lee W. Saperstein, P. L. Michael, James H. Prout, 1973 .