TY  - RPRT
TI  - Declining scaup populations: issues, hypotheses, and research needs
AU  - J. E. Austin
AU  - A. D. Afton
AU  - M.G. Anderson
AU  - R. G. Clark
AU  - Christine M. Custer
AU  - J.S. Lawrence
AU  - J.B. Pollard
AU  - J.K. Ringelman
PY  - 2000
UR  - https://pubs.usgs.gov/publication/1003542
ID  - 1003542
ER  -