TY  - RPRT
TI  - Annual survival rates of adult and immature eastern population tundra swans
AU  - James D. Nichols
AU  - J. Bart
AU  - Roland J. Limpert
AU  - William J.L. Sladen
AU  - James E. Hines
PY  - 1992
DO  - 10.2307/3808863
UR  - https://pubs.usgs.gov/publication/5222878
ID  - 5222878
ER  -