Howe, H M <br/><br/>
A needed invention in coal-mining.  [electronic resource] 

 -  Science (New York, N.Y.)  May 1887 
 - 516 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0036-8075 
<br/><br/><label>Standard No.: </label>10.1126/science.ns-9.225.516-a  doi