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Describes the explorations of the North and South Poles, including the expeditions of John Franklin, Roald Amundsen, Robert Peary, and Ernest Shackleton.
Discoveries in geography. --- Polar regions --- Polar regions --- Discovery and exploration --- Discovery and exploration.
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Douglas fir --- Growth. --- Spacing
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Douglas fir --- Forest soils --- Forest thinning --- Soils --- Forest site quality --- Growth. --- Thinning --- Fertilization --- Nitrogen content
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Douglas fir --- Douglas fir --- Growth. --- Fertilizers
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Douglas fir --- Douglas fir --- Forest soils --- Forest thinning --- Soils --- Forest site quality --- Growth. --- Thinning --- Fertilization --- Nitrogen content
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Douglas fir --- Douglas fir --- Growth. --- Spacing
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