Owls of the world :  their evolution, structure and ecology / 
illustrated by John Rignall, edited by John A. Burton, [contributors] Philip Burton [and others] 
 - [London] :  Peter Lowe,  c1973. 
 - 5-216 p. :  ill., col., maps. 
<br/><br/><label>ISBN: </label>0856546038 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Owls.