sub:Provenance { sub:Assertionprov:wasDerivedFromsub:Study . sub:Studydcterms:bibliographicCitation "Perry, M.C., P.C. Osenton, and E.J.R. Lohnes. 2004. Food habits of mute swans in Chesapeake Bay. In Mute Swans and their Chesapeake Bay Habitats: Proceedings of a Symposium: US Geological Survey, Biological Resources Discipline Information and Technology Report USGS/BRD/ITR-2004-0005 (ed MC Perry), pp. 31-36." . }