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Subject
- 29 Snow
- 28 Ice
- 20 Glaciers
- 15 Glacier ice
- 15 Greenland
- 11 Permafrost
- 10 Equipment
- 10 Frozen ground
- 9 Snow mechanics
- 8 Explosives
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Date issued
- 13 1960 - 1961
- 58 1950 - 1959