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Scientific American 1917-06-16

ScientificAmerican1917-06-16.jpg Scientific American 1914-12-12ThumbnailsScientific American 1918-06-01Scientific American 1914-12-12ThumbnailsScientific American 1918-06-01Scientific American 1914-12-12ThumbnailsScientific American 1918-06-01Scientific American 1914-12-12ThumbnailsScientific American 1918-06-01Scientific American 1914-12-12ThumbnailsScientific American 1918-06-01

Rushing work on wood ships to carry supplies through the submarine zone.