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Er vatnet vårt surt?
Select date| Date | Participant | Area |
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| 2012-05-25 | Bjertnes videregående skole | Harestuvannet |
| 2012-05-25 | Bjertnes videregående skole | Harestuvannet |
| 2012-05-25 | Bjertnes videregående skole | Harestuvannet |
| 2012-05-25 | Bjertnes videregående skole | Harestuvannet |
| 2012-05-25 | Bjertnes videregående skole | Harestuvannet |
| 2012-05-25 | Bjertnes videregående skole | Harestuvannet |
| 2005-08-30 | Bjertnes videregående skole | Harestuvannet |
| 2004-09-01 | Bjertnes videregående skole | Harestuvannet |
| 2000-09-06 | Bjertnes videregående skole | Harestuvannet |
| 2000-09-06 | Bjertnes videregående skole | Harestuvannet |
| 1996-08-30 | Bjertnes videregående skole | Harestuvannet |
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