Search U.S. government technical reports digitized or harvested by TRAIL.
Safety achievements of a Pennsylvania bituminous-coal mine and of a coal-mine superintendent
Mining statutes of the state of Pennsylvania(summarized)
A study of mine roof of the Pittsburgh coal bed in the Pittsburgh mining district
Factors and conditions that aid in alinement of pillar extraction lines in coal mining
Explosions in Pennsylvania coal mines, 1870-1932
A study of mine roof of the coking district of Western Pennsylvania
Studies of roof movement in coal mines.
Studies of roof movement in coal mines.
Water problem in the Pennsylvania anthracite mining region
Why men were killed at Pennsylvania anthracite mines in 1950
Design and testing of Bureau of Mines coal planer
Mine subsidence--extent and cost of control in a selected area.
Microfilming maps of abandoned anthracite mines :mines in the Western middle anthracite field
Methane emission rate studies in a central Pennsylvania mine
Selected geologic factors affecting mining of the Pittsburgh coalbed
Strata interactions in multiple-seam mining--two case studies in Pennsylvania
Effects of horizontal stress related to stream valleys on the stability of coal mine openings