s.a <br/><br/>
Hydraulic Conversion Tables and Convenient Equivalents. 

 - Washington  Government Printing Office  1917 
 - pp. 71-94 
<br/><br/> Impreso 
<br/><br/><br/>Ingles 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA