Published by US Dept. of the Interior: Bureau of Mines/Denver Mining Research Center, Denver, CO, 1980
Seller: Xochi's Bookstore & Gallery, Truth or consequences, NM, U.S.A.
Paper Back. Condition: Near Fine. No Jacket. 194pp.; SC beige w/blk.(no title on spine); clean,tight pgs. "A microseismic roof fall warning system was field tested in Western and Eastern coal mines in the US to better define the capabilities & limitations of the microseismic method in predicting roof fall. Based on the results & experience obtained during field testing, a commercial prototype microseismic roof fall warning system was designed and constructed." photos,graphs,etc. Final Report - Contract No. H0272009.