1960 



Bruun, B. 1960. De yngleende Knopenvaners ( Cygnus olor Gm.) fordeling mellum 

 Kysten og inlandet i Danmark 1935-1959. [Distribution of the Mute Swan 

 ( Cygnus olor (Gm.)) along the coast and in the interior of Denmark 1935- 

 1959.] Dan. Ornithol. Foren. Tidsskr. 54: 77-84. [In Danish with English 

 summary. ] 



Campbell, B. 1960. The Mute Swan census in England and Wales 1955-56. Bird 

 Study 7: 208-223. 



Sokolowski, J. 1960. The Mute Swan in Poland. State Council Conservation 

 Nature (Warsaw) 1: 1-28. 



1959 



Boase, H. 1959. Notes on the display, nesting and moult of the Mute Swan. 

 Brit. Birds 52: 114-123. 



1957 



Ticehurst, N. F. 1957. The Mute Swan in England. Cleaver-Hume Press, London, 

 xiv and 133 pp. 



Zajac, R. 1957. Z baden nad labedziem niemym ( Cygnus olor Gmel.) w wojewod- 

 ztwie szczecinskim. [Investigations on the Mute Swan ( Cygnus olor Gmel.) 

 in the Szczecin Voivodship.] Przyr. Pol. Zach. Is 139-146. [In Polish 

 with English summary.] 



1956 



Gillham, M. E. 1956. Feeding habits and seasonal movements of Mute Swans on 

 two South Devon estuaries. Bird Study 3: 205-212. 



Lawrence, L. de K. 1956. The following reaction in a brood of Mute Swans. 

 Auk 73: 268. 



1954 



Staebler, A. E. 1954. Mute Swan ( Cygnus olor ) observed diving. Auk 71: 90. 



1951 



Harle, D. F. 1951. Mute Swans feeding on standing oats. Brit. Birds 44: 

 287-288. 



1950 



Ellis, J. C. S. 1950. Aggressive behaviour of a Mute Swan. Brit. Birds 43: 

 125-126. 



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