Cocheba, J. Donald. Langford, A. William. <br/><br/>
The wildlife valuation problem:  critical review of economic approaches 
William A. Langford, Donald J. Cocheba 
 - Canada  Canadian wildlife service  1978 
 - 37 p. 
<br/><br/><label>ISBN: </label>0-662-01546-0 
<br/><br/><label>Dewey Class. No.: </label>590.971  / CAN