Sugden, G.Lawson. <br/><br/>
Canvasback habitat use and production in saskatchewan parklands 
Lawson G. Sugden 
 - Canada  Canidian wildlife service  1978 
 - 32 p. 
<br/><br/><label>ISBN: </label>0-662-0419-7 
<br/><br/><label>Dewey Class. No.: </label>590.971  / CAN