Panel system of coal mining, a graphical study of percentage of extraction
By: by C.M. Young ...
Series: University of Illinois. Engineering Experiment Station. Bulletin; no. 113
Publisher: University of Illinois
Published: 1919
Place of publication: Urbana
Language: eng
Number of pages: 76
Subjects: Coal mines and mining.
Notes: On cover: University of Illinois bulletin ... vol.XVI, no. 39.
"List of publications of the engineering experiment station": p. 75-76.