4 results on '"Halvorsen, Godtfred A."'
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2. Tracing Recovery from Acidification in the Western Norwegian Nausta Watershed
3. Distribution of benthic invertebrates in relation to environmental factors. A study of European remote alpine lake ecosystems
4. Saetheriella amplicristatagen. n., sp. n., a new Orthocladiinae (Diptera: Chironomidae) from Tennessee
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