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A Map of the Chief Plains and Craters of the Moon

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A Map of the Chief Plains and Craters of the Moon.jpg Wing of a Bird, Showing the Arrangement of the FeathersThumbnailsThe Spectroscope, an Instrument for Analysing LightWing of a Bird, Showing the Arrangement of the FeathersThumbnailsThe Spectroscope, an Instrument for Analysing LightWing of a Bird, Showing the Arrangement of the FeathersThumbnailsThe Spectroscope, an Instrument for Analysing LightWing of a Bird, Showing the Arrangement of the FeathersThumbnailsThe Spectroscope, an Instrument for Analysing LightWing of a Bird, Showing the Arrangement of the FeathersThumbnailsThe Spectroscope, an Instrument for Analysing LightWing of a Bird, Showing the Arrangement of the FeathersThumbnailsThe Spectroscope, an Instrument for Analysing LightWing of a Bird, Showing the Arrangement of the FeathersThumbnailsThe Spectroscope, an Instrument for Analysing Light

The plains were originally supposed to be seas: hence the name "Mare."