Illinois Department of Conservation: Paul Moore 
Minnesota Department of Conservation: Bob Jessen 
Louisiana Wild Life and Fisheries 
Commission: Morton Smith 
West Virginia Department of 
Conservation: Jack Donnelly 
Bureau of Sport Fisheries and 
Wildlife: Samuel Carney Merrill Hammond 
Vernon Conover Arthur Hawkins 
Herbert Duncan Harvey Nelson 
Aelred Geis John Waters 
William Green 
Supplemental wing collections from the Central and Pacific Flyways 
were made by personnel in the Refuge Branch of the Bureau of Sport 
Fisheries and Wildlifee Supplemental samples of wings also were made by 
many different people in the Mississippi Flyway at the request of 
Arthur S. Hawkins. 
Many individuals and State and Federal agencies contributed the 
known-age material from which techniques were derived for determining 
the age and sex of many species of ducks. 
Perhaps most important, approximately 1,440 duck hunters sent 
the wings that made the study possible. 
PROCEDURES 
Selection of the Hunters Sampled 
Hunters from whom wings were solicited were selected from 
respondents to the Bureau's Annual Mail Questionnaire Survey of 
Waterfowl Hunters for 1958 and 1957. Records of two years were 
used in the selection because names and addresses of some of the 
respondents had been destroyed during a fire in the Machine Data 
Processing Room at Patuxent. 
These lists were then reduced by removing the names of all 
persons under 16 years of age and of all others who reported that 
they had killed no ducks. Hunters who did not kill ducks were 
removed from the list because we believed that their kill in 
1959-60 probably would make up a very small portion of the total, 
and that therefore the expense of including them in the survey was 
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