 TheTwin Sisters Mountain, North Twin Sister, South Twin Sister, Skookum Peak, Hayden and Little Sister, Twin Crest Peak
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 The Twin Quasar Q0957+561 and NGC 3079
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 Former Craig Spence house in Kalorama, DC
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 Diamond DA42 Twin Star
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 Fluorite spinel twin, 2 cm on 7 cm specimen. Composition plane horizontal. Naica,Chihuahua, Mexico.
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