Bird census and atlas studies : proceedings of the XI International Conference on Bird Census and Atlas Work ... / 
Edited by K. Stastny & V. Bejcek. 
 -- Prague :   Institute of Applied Ecology and Ecotechnology, Agricultural University,   cop. 1990 
 - 492 p.  il. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Aves - Censos<br/>Aves - Congresos y Asambleas
<br/><br/><label>Universal Decimal Class. No.: </label>598.2:57.084