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WWT Slimbridge Wetland Centre - Livre
Coloured key to the Wildfowl of the World
Peter Scott
Wildfowl & Wetlands Trust, Slimbridge, 1957
Revised and reprinted 1961
Further revision 1965, 1968, 1972
Reprinted 1977
Further revisions 1988, 1998
Updated 2006
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