Using sulfur hexafluoride as a gaseous tracer to study ventilation systems in mines.  by E.D. Thimons, R.J. Bielicki, and F.N. Kissell.
Contributors: Bielicki, R.J.; Kissell, F.N.
Publisher: U.S.  Bureau of Mines
Place of publication: Washington
Language: eng
Number of pages: 22
Notes: 11