Subject
- Harlequin duck -- Effect of oil spills on -- Alaska -- Prince William Sound2
- Oil spills -- Environmental aspects -- Alaska -- Prince William Sound2
- Exxon Valdez Oil Spill, Alaska, 19891
- Harlequin duck -- Alaska -- Prince William Sound1
- Harlequin duck -- Behavior -- Alaska -- Prince William Sound1
- Harlequin duck -- Food -- Alaska -- Prince William Sound1
- Harlequin duck -- Habitat1
- Oil spills and wildlife -- Environmental aspects -- Alaska -- Prince William Sound1
- Prince William Sound (Alaska)1