Trends in underground coal mining in Indiana
By: by Denver Harper.
Contributors: Indiana. Dept. of Natural Resources.
Series: Geological survey occasional paper ;; 33
Publisher: Dept. of Natural Resources; For sale by Geological Survey
Published: 1981
Place of publication: Bloomington, Ind
Language: eng
Number of pages: 13
Subjects: Coal mines and mining -- Indiana.
Notes: Bibliography: p. 12-13.