Nelik, Lev <br/><br/>
Progressing cavity pumps, downhole pumps and mudmotors / 
Lev Nelik and Jim Brennan 
 - Houston, TX  :  Gulf Pub.,  c2005 
 - xxviii, 215 p. :  ill. ;  19 cm. 
<br/><br/>Includes bibliographical references (p.213-214) and index 
<br/><br/><label>ISBN: </label>9780976511311 0976511312 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pumping machinery<br/>oil well pumps