TY  - RPRT
TI  - Body size and condition of male mallard during mid-winter in North Dakota, USA
AU  - R.E. Olsen
AU  - R. R. Cox
PY  - 2003
DO  - 10.1675/1524-4695(2003)026[0449:bsacom]2.0.co;2
UR  - https://pubs.usgs.gov/publication/1001826
ID  - 1001826
ER  -