Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Roof movement study of mechanized retreating longwall operation, lancashire no. 15 mine, bakerton, cambria county, pa
Nature and physical properties of strata and strata movements of Lower Kittanning coal bed; mining method, equipment, roof support method, and cycle of mining; convergence in entries and at face; differential roof movements; observations with stratascope.
Roof movement study of mechanized retreating longwall operation, lancashire no. 15 mine, bakerton, cambria county, pa
Nature and physical properties of strata and strata movements of Lower Kittanning coal bed; mining method, equipment, roof support method, and cycle of mining; convergence in entries and at face; differential roof movements; observations with stratascope.
Roof movement study of mechanized retreating longwall operation, lancashire no. 15 mine, bakerton, cambria county, pa
U S Bur Mines -- Report Investigations
Barry, A.J. (Autor:in) / Wojciechowski, J.J. (Autor:in)
1954
13 pages
23 Supp Plates
Report
Englisch
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