Roof rock structures and related roof support problems in the Pittsburgh coalbeds of southwestern Pennsylvania
By: by Noel N. Moebs.
Contributors: United States. Bureau of Mines.
Series: Report of investigations - Bureau of Mines ; 8230; Report of investigations (United States. Bureau of Mines) -- 8230.
Publisher: Dept. of the Interior, Bureau of Mines
Published: 1977
Place of publication: [Washington]
Language: eng
Number of pages: 30
Subjects: Coal -- Geology -- Pennsylvania -- Pittsburgh.; Mine timbering.; Mine roof bolting.
Notes: Includes bibliographical references and appendix.