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Scientific American 1917-04-28

ScientificAmerican1917-04-28.jpg Scientific American 1917-04-21ThumbnailsScientific American 1917-05-05Scientific American 1917-04-21ThumbnailsScientific American 1917-05-05Scientific American 1917-04-21ThumbnailsScientific American 1917-05-05Scientific American 1917-04-21ThumbnailsScientific American 1917-05-05Scientific American 1917-04-21ThumbnailsScientific American 1917-05-05

The airmen's lighthouse illuminating a safe landing place.