Geologic investigation of roof and floor strata
Subtitle: longwall demonstration, Old Ben Mine no. 24 : prediction of coal balls in the Herrin coal : final technical report, part 2
By: Philip J. DeMaris ... [et al.].
Series: ISGS contract/grant report -- 1983-2
Publisher: Illinois Dept. of Energy and Natural Resources, State Geological Survey Division
Published: 1983
Place of publication: Champaign, Ill
Language: eng
Number of pages: 69
Subjects: Coal balls
Notes: Includes bibliographical references (p. 49-51).