Helweg, Otto J. <br/><br/>
Improving well and pump efficiency 
Otto J. Helweg, Verne H. Scott, Joseph C. Scalmanini 
 - Denver  American Water Works Association  1984 
 - 158 p.  il. n.  23 cm 
<br/><br/><label>ISBN: </label>0898672848 
<br/><br/><label>Subjects--Index Terms: </label>Ingenieria hidraulica