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- Research 543 Treffer
- Discovery and exploration 535 Treffer
- Scientific expeditions 254 Treffer
- Geology 232 Treffer
- Periodicals 198 Treffer
- International status 148 Treffer
- Description and travel 138 Treffer
- History 138 Treffer
- Congresses 101 Treffer
- Natural history 99 Treffer
- Ice 89 Treffer
- Travel 87 Treffer
- Antarctic Treaty system 86 Treffer
- Environmental protection 84 Treffer
- Explorers 83 Treffer
- British 79 Treffer
- Nautical charts 77 Treffer
- Environmental aspects 71 Treffer
- Meteorology 68 Treffer
- Ecology 63 Treffer
- Climate 53 Treffer
- Handbooks, manuals, etc 53 Treffer
- Geophysics 49 Treffer
- Glaciers 49 Treffer
- Oceanography 49 Treffer
- Geology, Stratigraphic 48 Treffer
- Tourism 48 Treffer
- Bibliography 47 Treffer
- Geomagnetism 45 Treffer
- Zoology 43 Treffer
- Birds 40 Treffer
- Sea ice 40 Treffer
- Earth sciences 39 Treffer
- Natural resources 38 Treffer
- Historic sites 37 Treffer
- Ice sheets 37 Treffer
- Marine biology 37 Treffer
- Australian 36 Treffer
- Environmental impact analysis 36 Treffer
- Environmental conditions 35 Treffer
- Equipment and supplies 33 Treffer
- Observations 33 Treffer
- Biology 32 Treffer
- Climatic changes 32 Treffer
- Law and legislation 32 Treffer
- Conservation of natural resources 30 Treffer
- Conservation and restoration 29 Treffer
- Measurement 29 Treffer
- Effect of human beings on 26 Treffer
- Marine resources conservation 26 Treffer mehr …