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(*ICE
4
Ice and Permafrost
4
Snow
4
GREAT LAKES)
3
MAPS
3
PERIODIC VARIATIONS
3
WINTER
3
AERIAL RECONNAISSANCE
2
ATMOSPHERIC TEMPERATURE
2
FREEZING
2
LAKE SUPERIOR
2
MAPPING
2
Meteorology
2
(*AERIAL RECONNAISSANCE
1
*GREAT LAKES)
1
CLIMATE
1
CORRELATION TECHNIQUES
1
DISTRIBUTION
1
ICE PREVENTION
1
ICE)
1
LAKE ERIE
1
LAKE HURON
1
LAKE MICHIGAN
1
LAKE ONTARIO
1
MELTING
1
METEOROLOGICAL CHARTS
1
PHASE STUDIES
1
STATISTICAL DATA
1
SURVEYING(GEOGRAPHIC)
1
TEMPERATURE
1
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