Basic estimated capital investment and operating costs for underground bituminous coal mines:  mines with annual production of 1.06 to 4.99 million tons from a 72-inch coalbed.  by Sidney Katell and E.L. Hemingway
Contributors: Hemingway, E.L.
Publisher: U.S. Dept. of the Interior
Place of publication: Washington
Language: eng
Number of pages: 41
Notes: 11