TY  - RPRT
TI  - Declines of greater and lesser 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. Lawrence
AU  - J.B. Pollard
AU  - J.K. Ringelman
PY  - 2000
UR  - https://pubs.usgs.gov/publication/1001092
ID  - 1001092
ER  -