Use of subaudible noises for prediction of rock bursts. Obert, L. & Duvall, W. U.S. Bur. Mines Rept. Invest., 1942.
bibtex   
@article{obert1942,
	Author = {Obert, Leonard and Duvall, W.},
	Date-Added = {2014-03-17 07:35:03 +0000},
	Date-Modified = {2014-03-17 07:36:49 +0000},
	Journal = {U.S. Bur. Mines Rept. Invest.},
	Title = {Use of subaudible noises for prediction of rock bursts},
	Volume = {3634},
	Year = {1942}}

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