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Stefansson
1
U. S. Geological Survey
1
U.S. Engineer
1
U.S. Geological Survey
1
United States. -- Alaska -- 20th Century
1
Wild Life
1
atmospheric phenomena
1
aviator-explorer
1
black rapid
1
black rapids ice mountain
1
blind spot
1
clock
1
dredge
1
earthquake
1
glacier's foot
1
ice
1
mining
1
mining school
1
mountain
1
performance charts
1
plane
1
post office
1
radio message
1
report
1
snail
1
sweepstakes
1
third attempt
1
top of the world
1