Coal mines rescue rules, 1939 

 -  1955 
<br/><br/><label>Standard No.: </label>67772 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>ECONOMICS
<br/><br/><label>Dewey Class. No.: </label>X9F551:9455qN39, J5