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Unidentified scientists during the Lusiad Expedition (1962-63) shown here on the research ship Argo. This expedition was an international effort to explore the Indian Ocean. On this expedition, the Scripps Institution of Oceanography research vessels Horizon and Argo sailed around the world to study the Indian Ocean, its currents and map its seafloor. Circa 1963.

Unidentified scientists during the Lusiad Expedition (1962-63) shown here on the research ship Argo. This expedition was a...