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Belgium
28
Flanders
Rivers
Dredging
16
Floods
16
Germany
16
Hydrography
16
Netherlands
16
Tides
16
Water policy
16
Aquatic organisms
12
Biology and Life Sciences
12
Ecological assessment
12
European Union
12
Fresh water
12
Freshwater ecology
12
Invertebrates
12
Lakes
12
Surface water
12
Water Framework Directive
12
Water quality
12