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Subject
- airplanes3
- antarctica--aerial exploration1
- buildings1
- discovery and exploration4
- ellsworth, lincoln, 1880-19514
- equipment and supplies1
- explorers4
- hearst, william randolph, 19082
- icebreakers (ships)3
- meteorological stations1
- penguins3
- scientific expeditions6
- sea ice2
- shipment of goods1
- skiing1
- wilkins, george h. (george hubert), sir, 1888-19582