TY  - BOOK
ED  - United States.
TI  - Operating regulations to govern coal-mining methods and the safety and welfare of miners: on leased lands on the public domain under the act of February 25, 1920 (41 Stat. 437) and amendments thereto
AV  - TN23 .U75 1938
PY  - 1938///
CY  - Washington
PB  - U.S. Govt. print. off.
KW  - Coal mines and mining
KW  - United States
KW  - Safety measures
KW  - Public lands
KW  - Mining law
N1  - At head of title: United States Department of the interior
ER  -