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Ventilation at anthracite collieries of Northern Pennsylvania Field
Description of methods and practices, based upon inspections in 20 of larger collieries during 1933 and 1934; and supplementary information furnished by operating officials.
Ventilation at anthracite collieries of Northern Pennsylvania Field
Description of methods and practices, based upon inspections in 20 of larger collieries during 1933 and 1934; and supplementary information furnished by operating officials.
Ventilation at anthracite collieries of Northern Pennsylvania Field
U S Bur Mines -- Information Cir
McElroy, G.E. (author)
1937
23 pages
Report
English
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Barrier pillars in Lackawanna Basin, northern field, anthracite region of Pennsylvania
Engineering Index Backfile | 1952
|Inundated anthracite reserves: Eastern Middle field of Pennsylvania
Engineering Index Backfile | 1950
|Barrier pillars in southern field, anthracite region of Pennsylvania
Engineering Index Backfile | 1953
|