TY  - RPRT
TI  - Sex ratios and age raios in North American ducks
AU  - Frank C. Bellrose
AU  - Thomas G. Scott
AU  - Arthur S. Hawkins
AU  - Jessop B. Low
PY  - 1961
DO  - 10.21900/j.inhs.v27.175
UR  - https://pubs.usgs.gov/publication/70243783
ID  - 70243783
ER  -