Underground coal mining
Subtitle: production and cost functions
By: by Alan Lyle Halvorson
Published: 1981
Language: eng
Number of pages: 201
Notes: Thesis (Ph. D.)--George Washington University, 1981.

Bibliography: leaves 196-201.

Microfilm. Ann Arbor, MI : University Microfilms International, 1981. 1 microfilm reel.  35 mm. ([Publication] / University Microfilms International ; 81-19898)