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Hydraulic goaf packing
From description by Frantzen in Bul. de la Soc. Min. Deals with results obtained. (2200 w.) (No. 61239 A)
Hydraulic goaf packing
From description by Frantzen in Bul. de la Soc. Min. Deals with results obtained. (2200 w.) (No. 61239 A)
Hydraulic goaf packing
Col Guard
1915
Aufsatz (Zeitschrift)
Englisch
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