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Subject
- glenn, john, 1921-201612
- family life6
- scientific expeditions6
- ellsworth, lincoln, 1880-19514
- explorers4
- airplanes3
- discovery and exploration3
- fighter plane combat3
- icebreakers (ships)3
- korean war, 1950-19533
- penguins3
- alfalfa2
- children--nutrition2
- crops and soils2
- hearst, william randolph, 19082
- motion picture authorship2
- motion picture producers and directors2
- sea ice2
- soil amendments2
- soil and crop management2