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Antarctic regions
12
Scientific expeditions
4
Antarctic Ocean
3
Scientific cooperation
3
Drinking water
2
International Geophysical Year
2
Living conditions
2
Research
2
Scientists
2
Sea ice
2
Water supply
2
Water treatment
2
Air pollution
1
Animal behaviour
1
Animal ecology
1
Biological research
1
Birds
1
Climate change
1
Deserts
1
Di Castri
1
Ecology
1
Ecosystems
1
Environmental conservation
1
Environmentalists
1
Francesco
1
Geomagnetism
1
Glaciology
1
Global commons
1
International Whaling Commission
1
International instruments
1
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