Ventilation eddy zones at a model coal mine working face /
by Fred N. Kissell and Richard J. Bielicki.
- [Washington] : U.S. Dept. of the Interior, Bureau of Mines, [1974].
- 14 p.
- Report of investigations ; 7991 .
- United States. Bureau of Mines. Report of investigations ; 7991 .
- Report of investigations (United States. Bureau of Mines) ; 7991 .