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. 

 - Second edition. 
 - Washington,  U.S. Govt. print. off.,  1938. 
 - ii, 46 p.  23 cm. 
<br/><br/> At head of title: United States Department of the interior. 
<br/><br/><label>LCCN: </label>gs 38000127  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Coal mines and mining--United States.<br/>Coal mines and mining--Safety measures.<br/>Public lands--United States.<br/>Mining law--United States.
<br/><br/><label>LC Class. No.: </label>TN23  / .U75 1938