Guide to geologic features affecting coal mine roof
By: by Robert Lee Stahl
Contributors: United States. Mine Safety and Health Administration
Series: Informational report - Mine Safety and Health Administration ; IR 1101; Informational report (United States. Mine Safety and Health Administration) -- IR 1101
Publisher: Dept. of Labor, Mine Safety and Health Administration
Published: 1979
Place of publication: [Arlington, Va.]
Language: eng
Number of pages: 18
Subjects: Mine roof bolting; Coal mines and mining
Notes: Errata sheet correcting arrangement of photographs on page 3 was issued also

Bibliography: p. 17