Geologic causes and possible preventions of roof fall in room-and-pillar coal mines
By: by Bion H. Kent ; prepared by the United States Geological Survey in cooperation with the Pennsylvania Geological Survey.
Contributors: Geological Survey (U.S.); Pennsylvania. Bureau of Topographic and Geologic Survey.
Series: Information circular - Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey ; 75
Publisher: Pennsylvania Geological Survey : may be purchased from State Book Store
Published: 1974
Place of publication: Harrisburg
Language: eng
Number of pages: 17
Subjects: Geology -- Pennsylvania -- Greene County.; Coal mines and mining -- Pennsylvania -- Greene County.; Mine accidents.
Notes: Bibliography: p. 16-17.
"Pennsylvania Geological Survey fourth series."