TY  - RPRT
TI  - An automatic camera device for measuring waterfowl use
AU  - Lewis M. Cowardin
AU  - J.E. Ashe
PY  - 1965
DO  - 10.2307/3798066
UR  - https://pubs.usgs.gov/publication/1001418
ID  - 1001418
ER  -