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- Subject is exactly "Surveying"
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Surveying on Cataract Creek 9.6 miles below Havasu Creek.
Three men stand on large boulders, one using surveying equipment. High cliff walls in the background.
Grand canyon. Downstream view of dam site 2.5 miles above Bright Angel Creek
One man stands in the Colorado River, using surveying equipment. A second sits on a rock nearby.