TY  - RPRT
TI  - Population ecology of the mallard: IV. A review of duck hunting regulations, activity, and success, with special reference to the mallard
AU  - Elwood M. Martin
AU  - Samuel M. Carney
PY  - 1977
UR  - https://pubs.usgs.gov/publication/rp130
ID  - rp130
ER  -