Agor ,R <br/><br/>
Textbook of advanced surveying /3rd ed. 

 - 3rd ed. 
 - New Delhi  Khanna Publishers  1997 
 - 674p. 
<br/><br/><label>Subjects--Index Terms: </label>624:528.4 
<br/><br/><label>Dewey Class. No.: </label>624:528.4  / AGO