ScientificAmerican1921-01-01.jpg Scientific American 1920-12-25ThumbnailsScientific American 1921-01-08Scientific American 1920-12-25ThumbnailsScientific American 1921-01-08Scientific American 1920-12-25ThumbnailsScientific American 1921-01-08Scientific American 1920-12-25ThumbnailsScientific American 1921-01-08

Exploring the ocean bottom with the deep-sea sounding equipment. Also: "Automotive milestones" and "where is that rattle?"




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