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; University of Illinois bulletin -- v. 16, no. 39; Bulletin (University of Illinois (Urbana-Champaign campus). Engineering Experiment Station) -- no. 113
Publisher: University of Illinois
Published: 1919
Place of publication: Urbana
Language: eng
Number of pages: 76
Subjects: Coal mines and mining.