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first reported his measurement in the inaugural volume of the Lowell Observatory Bulletin. Three years later, he wrote a review in the journal Popular Astronomy. In it he stated that "the early discovery that the great Andromeda spiral had the quite exceptional velocity of -300 km[/s] showed the means then available, capable of investigating not only the spectra of the spirals but their velocities as well." Slipher reported the velocities

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