1946 

 Peterson, R. T. 1946. Thousands of Ruddies. Wood Thrush 1: 2. 



1941 

 Low, J. 1941. Nesting of the Ruddy Duck in Iowa. Auk 58: 506-517. 

 Mitchell, E. T. 1941. An isolated Ruddy Duck colony. Flicker 13: 23-24. 



1940 



Zimmerman, F. R. 1940. The Ruddy Duck in Wisconsin. Passenger Pigeon 2: 111- 

 116. 



1938 



Bennett, L. J. 1938. Redheads and Ruddy Ducks nesting in Iowa. Trans N. Am. 

 Wildl. Conf. 3: 647-650. 



Orr, R. T. 1938. An unusually early molt in the Ruddy Duck. Condor 40: 87. 



1925 



Townsend, C. W. 1925. Courtship of the Ruddy Duck and of the Coot. Bull. 

 Essex Co. Ornithol. Club 7: 5-6. 



1923 



van Rossem, A. J. 1923. A note on the voice of the Ruddy Duck. Condor 25: 

 131. 



1918 



Wetmore, A. 1918. A note on the tracheal air-sac in the Ruddy Duck. Condor 

 20: 19-20. 



1917 



Wetmore, A. 1917. On certain secondary sexual characteristics in the male 

 Ruddy Duck, Erismatura jamaicensis (Gmelin). Proc . U.S. Natl. Mus . 52: 

 479-482. 



466 



