TY  - RPRT
TI  - Behaviour of wintering Tundra Swans Cygnus columbianus columbianus at the Eel River delta and Humboldt Bay, California, USA
AU  - Jeffrey M. Black
AU  - Carol Gress
AU  - Jacob W. Byers
AU  - Emily Jennings
AU  - Craig R. Ely
PY  - 2010
UR  - https://pubs.usgs.gov/publication/70101079
ID  - 70101079
ER  -