Modified Longwall Mining with a German Coal Planer
Modified Longwall Mining with a German Coal Planer
Preparation Characteristics of Coal from Bell County, Ky
Extraction of Pillars with Mechanized Equipment
The Use of Augers in Surface Mining of Bituminous Coal
The Use of Augers in Surface Mining of Bituminous Coal
Report of Investigations 4922-23
Report of Investigations 4917-4930
Information Circular 7798-7820
Information Circular 7624-7640
Factors Affecting the Incendivity of Permissible Explosives
Mississippian Rugose Corals, Peratrovich Formation, West Coast, Prince of Wales Island, Southeastern Alaska