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Subject
- 39 Ice
- 36 EPOLAR
- 30 Cold weather conditions
- 29 Arctic regions
- 28 Frozen ground
- 27 Construction
- 27 Snow
- 24 Permafrost
- 22 Soils
- 19 Alaska
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Date issued
- 10 2020 - 2023
- 6 2010 - 2019
- 38 1990 - 1999
- 82 1980 - 1989
- 56 1970 - 1979
- 36 1961 - 1969