Gray, George R.  1907- <br/><br/>
Composition and properties of oil well drilling fluids / 
George R. Gray, H.C.H. Darley. 
 - 4th ed 
 - Book Division, Houston, Tex. :  Gulf Publishing Co.,  1980. 
 - 630 p. :  ill. ;  24 cm. 
<br/><br/> First-3d ed. by W. F. Rogers. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0872011291 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Drilling muds.