Duiken 2015 : 20150419 : 20150419-S599-Ton-bij-kooi-plasKatwijk

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20150419-S598-Dreissena-rostriformis-bugensis-Quaggamossel-plasKatwijk

20150419-S601-Dreissena-rostriformis-bugensis-Quaggamossel-plasKatwijk

20150419-S598-Dreissena-rostriformis-bugensis-Quaggamossel-plasKatwijk

20150419-S601-Dreissena-rostriformis-bugensis-Quaggamossel-plasKatwijk