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Threshold level 1990 / by J.A. van Ek and J.L.M. Trim.
- 428.0071 E366
- Ek, Jan Ate van.
- Council of Europe Press,
- 1991 [reprinted 1993].
- [Strasbourg] :
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Threatened mammals in Europe / by C.J. Smit and A. van Wijngaarden.
- 599.094 S6421
- Smit, C. J.
- Council of Europe,
- 1976.
- [Strasbourg] :