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The James Wesley Powell expedition, which explored the Grand Canyon in 1869, consisted of a group of nine men. Key members included John Wesley Powell, the leader and geologist; Andrew Hall, a botanist; and William Dunn, a boatman. Other notable members were Frank Goodman, a photographer and writer, and O.G. Howland, a naturalist. The expedition was significant for its scientific observations and mapping of the Colorado River and the Grand Canyon.

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