Pollard, E. <br/><br/>
Monitoring butterflies for ecology and conservation :  the British butterfly monitoring scheme / 
E. Pollard, T. J. Yates. 
 - London :  Chapman & Hall,  1993. 
 - xiii, 274 p. :  ill. ;  24 cm. 
<br/><br/> 'Published in association with the Institute of Terrestrial Ecology (Natural Environmental Research Council) and the Joint Nature Conservation Committee' 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>0412402203 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Butterflies--Ecology--United Kingdom<br/>Butterflies--Monitoring--United Kingdom<br/>Wildlife conservation--United Kingdom