Ragan, Donal M, <br/><br/>
Structural geology:  an introduction to geometrical techniques/ 
Donal M. Ragan. 
 - 2nd edition. 
 - New York:  John Wiley & Sons,  1973. 
 - ix, 208 pages :  illustrations ;  28 cm. 
<br/><br/>pages 197-201. 
<br/><br/><label>ISBN: </label>0471704814 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology, Structural.