1951 



Hickey, J. J. 1951. Mortality records as indices of migration in the Mallard. 

 Condor 53: 284-297. 



1950 



Bellrose, F. C. and E. B. Chase. 1950. Population losses in the Mallard, 



Black Duck, and Blue-winged Teal. 111. Nat. Hist. Surv. Biol. Notes No. 

 22: 1-27. 



Gillham, E. H. 1950. Unusual Mallard's nest on Saltings. Brit. Birds 42: 190. 



Goetz, C. J. 1950. A Mallard thirteen years old. Bird-Banding 21: 18. 



Gullion, G. W. 1950. Mallards "mobbing" Cooper Hawks. Condor 52: 138-139. 



Hickling, R. A. 0. 1950. Joint "injury-feigning" by Shoveler and Mallard. 

 Brit. Birds 42: 304. 



Lebret, T. 1950. Vroeg begin van de rui naar het prachtkleed bij eerstejaars 

 van de Wilde Eend, Anas platyrhynchos L. Ardea 38: 235-236. [In Dutch.] 



Szczepski, J. B. 1950. Z biologii kaczki krzyzowki. [On the biology of the 

 Mallard.] Ochr. Przyr. Krakow 19: 185-199. [In Polish.] 



1949 



Blake, C. H. 1949. Mallard mortalities. Brit. Birds 42: 256. 



Hopkins, R. 1949. The fate of Mallards banded at Horicon. Wise. Conserv. 

 Bull. 14: 10-12. 



Ludgater, S. J. 1949. Curlew and Mallard laying in the same nest. Brit. 

 Birds 42: 362-363. 



Yocum, C. F. 1949. A study of sex ratios of Mallards in the state of Washing- 

 ton. Condor 51: 222-227. 



1948 



Hohn, E. 0. 1948. Mortality of adult and young Mallards. Brit. Birds 41: 

 233-235. 



1947 



Nicholson, W. W. 1947. Coition of Mallard on land. Brit. Birds 40: 152-153. 



Shaw, W. T. 1947. Relative weights: Ross Snow Goose and Mallard. Murrelet 

 28: 21. 



199 



