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river water
65
rivierwater
65
streams
65
waterlopen
65
canals
60
kanalen
60
nederland
60
netherlands
60
rivers
60
rivieren
60
water
50
biological properties
40
biologische eigenschappen
40
aquatic ecosystems
30
aquatische ecosystemen
30
biocenose
30
biocoenosis
30
hydrobiologie
30
hydrobiology
30
oppervlaktewater
30
surface water
30
binnenwateren
20
eigenschappen
20
fresh water
20
inland waters
20
lakes
20
meren
20
plassen
20
ponds
20
properties
20
reservoirs
20
zoet water
20
hydrologie
15
hydrology
15
acid rain
10
acidity
10
aquatic organisms
10
bacillariophyta
10
biological techniques
10
biologische monitoring
10
biologische technieken
10
biomonitoring
10
bodem
10
chemical composition
10
chemical properties
10
chemische eigenschappen
10
chemische samenstelling
10
droge depositie
10
dry deposition
10
ecohydrologie
10