Cover Image

Geologic factors causing roof instability and methane emission problems the Lower Kittaning coalbed, Cambria County, Pa. /

Main Author: McCulloch, C. M.
Other Authors: Deul, Maurice., United States. Bureau of Mines.
Format: Electronic
Language: English
Published: [Washington, D.C.?] : U.S. Dept. of the Interior, Bureau of Mines, [1973]
Physical Description: ii, 25 pages : digital, PDF file.
Series: Report of investigations (United States. Bureau of Mines) ; 7769.
Subjects:
Online Access: http://purl.access.gpo.gov/GPO/LPS97410