Comparison of aerial and ground surveying of subsidence over an active longwall
By: by John C. LaScola.
Series: Report of investigations ;; 9214; Report of investigations (United States. Bureau of Mines) ;; 9214.
Publisher: U.S. Dept. of the Interior, Bureau of Mines
Published: 1988
Place of publication: Pittsburgh, PA
Language: eng
Number of pages: 12
Subjects: Mine subsidences -- Pennsylvania -- Waynesburg Region -- Measurement.; Longwall mining -- Pennsylvania -- Waynesburg Region -- Safety measures.
Notes: Bibliography: p. 12.