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allison l bayles associates
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Feasibility Study and Supplement
Allison L. Bayles & Associates, Pittsburgh, Pa · Yayınevi bilinmiyor
156 sayfa · 1966
Coal mines and mining
Demonstration Mine Using Longwall Mining Techniques, Windber, Somerset County, Pennsylvania
Bayles (Allison L.) and associates, Pittsburgh · Yayınevi bilinmiyor
66 sayfa · 1966
Quarries and quarrying