TY  - RPRT
TI  - Polar bears in the Beaufort Sea: A 30-year mark-recapture case history
AU  - Steven C. Amstrup
AU  - T. L. McDonald
AU  - I. Stirling
PY  - 2001
DO  - 10.1198/108571101750524562
UR  - https://pubs.usgs.gov/publication/1013272
ID  - 1013272
ER  -