Atlantic Flyway Seaduck Study Perry 
M.C, and E.J.R. Lohnes.2001., Patuxent Wildlife Research Center, Laurel, MD. http://www.pwrc.usgs.gov/resshow/perry/scoters/

Bird Studies Canada 
http://www.bsc-eoc.org/bscmain.html

BC Coastal Waterbird Survey
http://www.bsc-eoc.org/

N. American Monitoring projects SDJV 
http://seaduckjv.org/studies/monitoring_surveys.html

USGS PatuxentWildlife Research Center--Bird Population Studies
http://www.mbr-pwrc.usgs.gov/