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ALTITUDE
4
DEPTH
inlandWaters
4
ABSENCE
3
ALKALINITY
3
AMMONIUM
3
ANTARCTICA
3
ANTARCTICA >
3
AREA
3
BACTERIA/ARCHAEA
3
BICARBONATE
3
BIOLUMINESCENCE
3
BOLINGEN ISLANDS
3
CALCIUM
3
CATCHMENT
3
CHLORINE
3
CONDUCTIVITY
3
CONTINENT >
3
CYANOBACTERIA
3
DIATOM
3
DIATOMS
3
EARTH SCIENCE
3
EARTH SCIENCE >
3
FIELD INVESTIGATION
3
FIELD SURVEYS
3
GEOGRAPHIC REGION >
3
LAKES/RESERVOIRS
3
LATITUDE
3
LONGITUDE
3
POLAR
3
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