TY  - RPRT
TI  - Establishing hunting regulations and allowable harvest of mallards in the United States
AU  - A. D. Geis
AU  - R. K. Martinson
AU  - David R. Anderson
PY  - 1969
DO  - 10.2307/3799316
UR  - https://pubs.usgs.gov/publication/5220657
ID  - 5220657
ER  -