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The chain-bag dredge used in all dredging operations on the Mid-Pacific Expedition. A complete dredge haul is displayed on the top of the dredge. Note the black coatings of manganese dioxide covering all of the rocks. Midpac Expedition, 1950

The chain-bag dredge used in all dredging operations on the Mid-Pacific Expedition. A complete dredge haul is displayed on...