2020 : 06 juni : 20200602-R156-Potamogeton-fonteinkruid-plant-plasKatwijk

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20200602-R154-Dreissena-rostriformis-bugensis-Quaggamossel-weekdier-plasKatwijk

20200602-R157-Potamogeton-crispus-Gekroesd-fonteinkruid-plant-plasKatwijk

20200602-R154-Dreissena-rostriformis-bugensis-Quaggamossel-weekdier-plasKatwijk

20200602-R157-Potamogeton-crispus-Gekroesd-fonteinkruid-plant-plasKatwijk