601
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602
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603
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604
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605
Published: 2001.
606
607
608
609
Published: c2013.
610
Published: 2011.
611
Published: 2014.
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612
Published: 2010.
613
Published: 1907
Superior document: Scientific papers 1
614
Published: 1939
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series I 161
615
Published: 1958
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 134
616
Published: 1933
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series I 97
617
Published: 1964
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 212
618
619
Published: 1940
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series I 197
620