Willem Kolvoort Onderwaterfotografie
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Freshwater
Underwater Landscapes
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Underwater Insects
Cnidaria
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Lung Snails
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Moss animals
Bivalves
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Beeldschoonwater, streams in Drenthe
Naardermeer
My pond
From the past
Split level pictures
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Worms
Sludge Worms ( Tubifex rivilorum )
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