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Subject
- explorers[remove]3
- scientific expeditions[remove]3
- airplanes2
- discovery and exploration2
- ellsworth, lincoln, 1880-19512
- antarctica--aerial exploration1
- equipment and supplies1
- hearst, william randolph, 19081
- icebreakers (ships)1
- penguins1
- shipment of goods1
- skiing1
- wilkins, george h. (george hubert), sir, 1888-19581