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nederland
30
netherlands
30
plankton
20
plassen
20
ponds
20
utrecht
20
aquatic ecology
10
aquatic organisms
10
aquatische ecologie
10
canals
10
ditches
10
eigenschappen
10
freshwater ecology
10
friesland
10
hydrobiologie
10
hydrobiology
10
inventarisaties
10
inventories
10
kanalen
10
lakes
10
macrofauna
10
marshes
10
meren
10
moerassen
10
national parks
10
nationale parken
10
nature reserves
10
natuurreservaten
10
oppervlaktewater
10
properties
10
reservoirs
10
river water
10
rivers
10
rivieren
10
rivierwater
10
sloten
10
streams
10
surface water
10
water
10
waterlopen
10
waterorganismen
10
zoetwaterecologie
10