Merikallio, Einari <br/><br/>
Finnish birds  : Their distribution and numbers 
/ Einari Merikallio 
 - Helsinki  : Societas pro fauna et flora fennica   , 1958 
 - 181 p.  ; 25 cm. 
<br/><br/><label>Subjects--Chronological Terms: </label><br/>S. XX 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Aves--Observación--Finlandia