TY  - RPRT
TI  - The need for experiments to understand population dynamics of American black ducks
AU  - David R. Anderson
AU  - K.P. Burnham
AU  - J.D. Nichols
AU  - M.J. Conroy
PY  - 1987
UR  - https://pubs.usgs.gov/publication/5222219
ID  - 5222219
ER  -