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Scientific American 1918-06-01

ScientificAmerican1918-06-01.jpg Scientific American 1904-09-03ThumbnailsScientific American 1920-08-21Scientific American 1904-09-03ThumbnailsScientific American 1920-08-21Scientific American 1904-09-03ThumbnailsScientific American 1920-08-21Scientific American 1904-09-03ThumbnailsScientific American 1920-08-21Scientific American 1904-09-03ThumbnailsScientific American 1920-08-21

A fleet of merchantmen under convoy as seen from a towed balloon.