1. Ducks, Geese, and Swans of North America;Bellrose,1976
2. Indicators of heavy metal contamination in the Looe estuary (Cornwall) with particular regard to silver and lead;Bryan;J. Mar. Biol. Assoc. U.K.,1977
3. Distribution and abundance of submerged aquatic vegetation in the tidal Potomac River — implications for waterfowl;Carter;Atl. Nat.,1980
4. The occurrence and toxicology of heavy metals in Chesapeake Bay waterfowl;Di Guilio,1982
5. Heavy metals in tissues of waterfowl from the Chesapeake Bay, U.S.A.;Di Guilio;Environ. Pollut. Ser. A,1984