TY  - RPRT
TI  - Behaviour of captive canvasbacks Aythya valisineria fed different diets during winter
AU  - Matthew C. Perry
AU  - B. Kenneth Williams
AU  - H.H. Obrecht
PY  - 1989
UR  - https://pubs.usgs.gov/publication/5222303
ID  - 5222303
ER  -