TY  - RPRT
TI  - Delineation of Tundra Swan Cygnus c. columbianus populations in North America: geographic boundaries and interchange
AU  - Craig R. Ely
AU  - William J.L. Sladen
AU  - Heather M. Wilson
AU  - Susan E. Savage
AU  - Kristine M. Sowl
AU  - Bill Henry
AU  - Mike Schwitters
AU  - James Snowden
PY  - 2014
UR  - https://pubs.usgs.gov/publication/70148012
ID  - 70148012
ER  -