TY  - RPRT
TI  - Extensive monitoring programmes viewed as long-term population studies: The case of North American waterfowl
AU  - J.D. Nichols
PY  - 2008
DO  - 10.1111/j.1474-919x.1991.tb07672.x
UR  - https://pubs.usgs.gov/publication/5222866
ID  - 5222866
ER  -