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Ardea Official journal of the Netherlands Ornithologists' Union |
| van Eerden M.R. (1984) Boekbespreking. Matthews G.V.T. & Smart M. 1981. Proceedings of the Second International Swan Symposium, Sapporo Japan. International Waterfowl Bureau, Slimbridge, England. ARDEA 72 (2): 251-251 |
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no summary available |