Report of investigations. 5290. Anthracite mechanical mining investigations, use of yielding steel supports (props) in combination with backfilling for mining thick, flat beds:by John C. Hartley, John D. Conner, sr., and Robert J. Brennan.
Publication Title:
Anthracite mechanical mining investigations, use of yielding steel supports (props) in combination with backfilling for mining thick, flat beds:by John C. Hartley, John D. Conner, sr., and Robert J. Brennan.
Display Title:
Report of investigations. 5290. Anthracite mechanical mining investigations, use of yielding steel supports (props) in combination with backfilling for mining thick, flat beds:by John C. Hartley, John D. Conner, sr., and Robert J. Brennan.
Series Title:
Report of investigations.
Corporate Agency Authors:
Mines Bureau and Interior Dept.
Sort Author:
Mines Bureau
Authors:
Hartley, John C., Conner, John D. sr., and Brennan, Robert J.
Date:
Dec. 1956
Publish Date ISO Format:
1956-12-01T00:00:00Z
Publication Start:
19561201
Publication End:
19561231
Corporate/Agency Author:
Mines Bureau
Publication month:
1
Publication year:
1956
SuDoc number:
I 28.23:(nos.)
Description:
[1]+ii+29 p. il. 4°
Notes:
[Processed.]
Notes:
[Processed.] † Distribution Made by Issuing Office. Mines Bureau, Pittsburgh, Pa.
Availability:
† Distribution Made by Issuing Office. Mines Bureau, Pittsburgh, Pa.