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1928
4
Arctic regions--Discovery and exploration
4
Louise A. Boyd Expedition in Search of Amundsen
4
Barrels
2
Glaciers
2
Mountains
2
Oil cans
2
Airplane wings
1
BOUNDARIES
1
Bodies of water
1
Coal mining
1
EARTH SCIENCE
1
Hydroplanes
1
LAND SURFACE
1
LAND USE/LAND COVER
1
Labor housing
1
PLANNINGCADASTRE
1
TOPOGRAPHY
1
maps
1
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