Burrough P A <br/><br/>
Principles of geographical information systems for 

 - Oxford  Clarendon Press           1987 
 - xiii,193p  cm. 
 - Monographs On Soil And Resources Survey. 12 .
<br/><br/> Appendix P 176-86 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geography
<br/><br/><label>Dewey Class. No.: </label>U673:(D6,9(B), M6