Willem Kolvoort Onderwaterfotografie
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Freshwater
Underwater Landscapes
Aquatic plants
Amphibians
Fishes
Underwater Insects
Cnidaria
Gill snails
Lung Snails
Protozoa
Moss animals
Bivalves
Rotifers
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Beeldschoonwater, streams in Drenthe
Naardermeer
My pond
From the past
Split level pictures
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Aquatic plants
Water knotweed ( Persicaria amphibia )
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