Topic
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blind spot
1
clock
1
dredge
1
earthquake
1
geologist
2
glacial movement
2
glacier
2
glacier race
2
glacier's foot
1
government geologist
2
ice
1
icefield
2
mining
1
mining school
1
mountain
1
mountain valley
2
performance charts
1
plane
1
post office
1
radio message
1
report
1
science
2
snail
1
snow
3
sweepstakes
1
the Muir glacier
2
third attempt
1
top of the world
1