Langowski , D. J. and R. L. Jessen. 1975. Distribution and chronology of Mal- 

 lards harvested in Minnesota. Bird-Banding 46: 33-39. 



Riseborough, R. W. and D. W. Anderson. 1975. Some effects of DDE and PCB on 

 Mallards and their eggs. J. Wildl. Manage. 39: 508-513. 



Tirara, D. E., S. 0. Morgan and R. E. Wood. 1975. Wolf as predator on Mallards 

 in a bait trap. Can. Field-Nat. 89: 322. 



Titman, R. D. and J. K. Lowther. 1975. The breeding behaviour of a crowded 

 population of Mallards. Can. J. Zool. 53: 1270-1283. 



1974 



Abraham, R. L. 1974. Vocalizations of the Mallard ( Anas platyrhynchos ) . Con- 

 dor 76: 401-420. 



Anderson, D. R. , P. A. Skaptason, K. G. Fahey and C. J. Henny. 1974. Popula- 

 tion ecology of the Mallard: III: bibliography of published research and 

 management findings. U.S. Fish & Wildl. Serv. Resour. Publ . No. 119. 

 46 pp. 



Crocker, A. D., J. Cronshaw and W. N. Holmes. 1974. The effect of a crude oil 

 on intestinal absorption in ducklings ( Anas platyrhynchos ) . Environ. 

 Pollut. 7: 165-177. 



Friend, M. and D. 0. Trainer. 1974. Response of different-age Mallards to DDT. 

 Bull. Environ. Contam. Toxicol. 11: 49-56. 



Greenwood, R. J. 1974. Reproductive aspects, growth, and development of Green- 

 land Mallards. Condor 76: 223-225. 



Haegele, M. A. and R. H. Hudson. 1974. Eggshell thinning and residues in Mal- 

 lards one year after DDE exposure. Arch. Environ. Contam. Toxicol. 2: 356- 

 363. 



Hailman, J. P. and J. J. I. Dzelzkalns. 1974. Mallard tail-wagging: punctu- 

 ation for animal communication? Am. Nat. 108: 236-238. 



Heath, R. G. and S. A. Hill. 1974. Nationwide organochlorine and mercury res- 

 idues in wings of adult Mallards and Black Ducks during 1969-70 hunting 

 season. Pest. Monit. J. 7: 153-164. 



Heinz, G. 1974. Effects of low dietary levels of raethylraercury on Mallard re- 

 production. Bull. Environ. Contam. Toxicol. 11: 386-392. 



Heusman, H. W. 1974. Mallard/Black Duck relationships in the northeast. 

 Wildl. Soc. Bull. 2: 171-177. 



Pirkola, M. K. and J. Hogmander. 1974. Sorsanpoikueiden ianmaaritys. [The age 

 determination of duck broods in the field.] Suomen Riista 25: 50-55. [In 

 Finnish with English summary.] 



186 



