Search
Search U.S. government technical reports digitized or harvested by TRAIL.
Keyword Search
23 results returnedSearch results
- 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
- Methods of development and pillar extraction in mining the Pittsburgh coal bed in Pennsylvania, West Virginia, and Ohio
- Studies of roof movement in coal mines.
- Studies of roof movement in coal mines.
- Water problem in the Pennsylvania anthracite mining region
- Backfilling problem in the anthracite region as it relates to conservation of anthracite and prevention of subsidence
- Why men were killed at Pennsylvania anthracite mines in 1950
- Modern automatic electrically controlled elevators for transporting men at two coal mines in Western Pennsylvania
- Design and testing of Bureau of Mines coal planer
- Microfilming maps of abandoned anthracite mines :mines in the Lackawanna Basin, northern anthracite field
- 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
- Methods of determining the orientations of bedrock fracture systems in southwestern Pennsylvania and northern West Virginia
- Geology, mining, and methane content of the Freeport and Kittanning coalbeds in Indiana and surrounding counties, Pa.
- 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
