✦ LIBER ✦

Improved design of coal pillars for us mining conditions : Proc 1st conference on ground control in mining, Morgantown, 27–29 July 1981, P13–22. Publ Morgantown: West Virginia University, 1981

✍ Scribed by Z.T. Bieniawski

No coin nor oath required. For personal study only.

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