Hydraulic mine filling
Subtitle: its use in the Pennsylvania anthracite fields. A preliminary report
By: by Charles Enzian.
Series: [U.S.] Bureau of mines. Bulletin; 60
Publisher: Govt. print. off.
Published: 1913
Place of publication: Washington
Language: eng
Number of pages: 77
Subjects: Coal mines and mining -- Pennsylvania.; Coal mines and mining -- Safety measures.; Anthracite coal -- Pennsylvania.
Other titles: Mine filling, Hydraulic.