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USSR
VEGETATION
ECOSYSTEMS
2
Ice and Permafrost
2
NATURAL RESOURCES
2
PERMAFROST
2
Snow
2
TRANSLATIONS
2
*ECOLOGY
1
*ENVIRONMENTAL PROTECTION
1
*GEOGRAPHY
1
*PERMAFROST
1
*POLAR REGIONS
1
*SOIL MECHANICS
1
*SUBARCTIC REGIONS
1
*SYMPOSIA
1
AIR POLLUTION
1
ALASKA
1
ARCTIC REGIONS
1
AST24
1
CIVIL ENGINEERING
1
CONSTRUCTION
1
CREEP
1
DAMAGE
1
DEPLETION
1
ENVIRONMENTAL ENGINEERING
1
ENVIRONMENTAL MANAGEMENT
1
ENVIRONMENTAL PROTECTION
1
EROSION
1
FISHES
1
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