search query: @keyword tractor / total: 4
references: 1-4 / 4
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| title | year | author | ||
| 1. | 2010 | Ronkainen, Ari |
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| 2. | 2007 | Kaivosoja, Jere |
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| 3. | 2005 | Linja, Markus |
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| 4. | 2004 | Pitkänen, Teppo Antero |
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