search query: @keyword Nature Conservation / total: 4
references: 1-4 / 4
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| title | year | author | ||
| 1. | 2003 | Sillanpää, Jouko |
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| 2. | 2003 | Viitakoski, Timo |
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| 3. | 2001 | Torkko, Markku |
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| 4. | 1999 | Manerus, Eero |
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