Spradley, L. Harold,  1938-. <br/><br/>
Surveying and navigation for geophysical exploration / 
L. Harold Spradley. 
 - Boston, Mass. :  International Human Resources Development Corp.,  1985. 
 - xi, 289 p. :  ill. ;  23 cm. 
<br/><br/>Includes bibliographical references (p. 281-283) and index. 
<br/><br/><label>ISBN: </label>0934634874 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Prospecting--Geophysical methods.<br/>Navigation.