Unwin, David J.  (David John) <br/><br/>
An introduction to trend surface analysis / 
by David J. Unwin. 
 - Norwich :  Geo Abstracts,  1975 
 - 42 p. :  ill. ;  21cm. 
 - Concepts and techniques in modern geography ;  no.5 .
 - Concepts and techniques in modern geography ;  no.5 .
<br/><br/>Bibliography : p.36-40 
<br/><br/><label>ISBN: </label>0902246518 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trend surface analysis.