Ahlen, Ingemar <br/><br/>
Identification of bats in flight / 
by Ingemar Ahlen 
 - Stockholm :  Swedish Society for Conservation of Nature,  1990 
 - 50 p. :  ill. ;  22 cm. 
<br/><br/>Includes bibliographical references (p.48-50) 
<br/><br/><label>ISBN: </label>9155850421 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Bats--Identification<br/>Bats--Flight