Helweg, Otto J. <br/><br/>
Improving well and pump efficiency 

 - (s.l.) :  American Water Works Association,  1984 
 - 158 p.  : gráfs. 
<br/><br/><label>LCCN: </label>13121 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Bombas mecánicas.<br/>Pozos.
<br/><br/><label>Dewey Class. No.: </label>621.64  / H4