Piper, C. F.Chuck <br/><br/>
Mud Equipment manual  Handbook 10: valves 

 - Houston  Gulf publishing  1985 
 - various pages 
<br/><br/><label>ISBN: </label>  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Civil engineering<br/>Engineering<br/>Soil mechanics
<br/><br/><label>Dewey Class. No.: </label>624.15136  / PIP