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The eminent selenographer, the late W.K. Birt, compared many of them to "inverted river-beds" from the fact that, as often as not, they become broader and deeper as they attain a higher level.— The Moon A Full Description and Map of its Principal Physical Features
Straight Wall, and the small mountain close by named after Birt, the well-known selenographer.— To Mars via The Moon An Astronomical Story

Century Dictionary (1)
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