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