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by Porter, J. G.
Published in The Astronomical Journal (1930)
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by Porter, J. G.
Published in The Astronomical Journal (1930)
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by Porter, J. G.
Published in The Astronomical Journal (1929)
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by Porter, J. G.
Published in The Astronomical Journal (1929)
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13
by Porter, J. G.
Published in PASP (1929)
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14
by Porter, J. G.
Published in The Astronomical Journal (1928)
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by Porter, J. G.
Published in The Astronomical Journal (1925)
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by Porter, J. G.
Published in The Astronomical Journal (1923)
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by Porter, J. G.
Published in The Astronomical Journal (1922)
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by Porter, J. G.
Published in The Astronomical Journal (1918)
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