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*ICE
1
*TUNNELS
1
*UNDERGROUND STRUCTURES
1
CONSTRUCTION
1
DRAINAGE
DRILLING
1
FOREIGN REPORTS
1
FREEZING
1
HEATING
1
ICE FORMATION
1
INSTALLATION
1
Ice and Permafrost
1
LAYERS
1
LININGS
1
LOW TEMPERATURE
1
MAINTENANCE
1
MOISTUREPROOFING
1
MOUNTAINS
RAILROAD TUNNELS
1
RAILROADS
1
SEEPAGE
1
SIBERIA
1
Snow
1
Surface Transportation and Equipment
1
TRANSLATIONS
1
TROUGHS
1
USSR
1
WATER
1
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