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WINTER NAVIGATION
*RIVERS
2
CONTROL
2
Ice and Permafrost
2
NAVIGATION
2
SAFETY
2
SITES
2
Snow
2
WINTER
2
*GLACIOLOGY
1
*ICE
1
*LIMNOLOGY
1
*RIVER ICE
1
ACCIDENTS
1
ALLEGHENY RIVER
1
ARCTIC WATERS
1
Arctic shipping
1
BOOMS(EQUIPMENT)
1
COVERINGS
1
Civil Engineering
1
Collision accidents
1
Convoy operations
1
DAMS
1
DATA ACQUISITION
1
DATA PROCESSING
1
DEFLECTOR BOOMS
1
DEFLECTORS
1
DEMONSTRATIONS
1
DESIGN
1
DISTRIBUTION
1
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