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Scientific American 1917-07-07

ScientificAmerican1917-07-07.jpg Scientific American 1903-05-23ThumbnailsSpicy-Adventure 1942-08Scientific American 1903-05-23ThumbnailsSpicy-Adventure 1942-08Scientific American 1903-05-23ThumbnailsSpicy-Adventure 1942-08Scientific American 1903-05-23ThumbnailsSpicy-Adventure 1942-08Scientific American 1903-05-23ThumbnailsSpicy-Adventure 1942-08

A horsepower race: The man who does the most work wins this race.