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Scientific American 1917-06-16

ScientificAmerican1917-06-16.jpg Scientific American 1915-05-22ThumbnailsScientific American 1928-09Scientific American 1915-05-22ThumbnailsScientific American 1928-09Scientific American 1915-05-22ThumbnailsScientific American 1928-09Scientific American 1915-05-22ThumbnailsScientific American 1928-09Scientific American 1915-05-22ThumbnailsScientific American 1928-09

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