Title: Design of Underground Openings in Competent Rock
Author: Obert, Leonard
Additional Author: Duvall, Wilbur I.
Additional Author: Merrill, Robert H.

Date: 1960
Link to Full Report:
Document Type: USBM
Issuing Agency: U.S. Bureau of Mines
Performing Organization: U.S. Bureau of Mines

Report Number: USBM Bulletin 587
SUDOC: TN 23 U4
Series: U.S. Bureau of Mines Bulletins