Edward Charles Pickering: Malsamoj inter versioj
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Linio 47:
* {{en}} [http://adsabs.harvard.edu/full/1919JRASC..13..165K Edward Charles Pickering, (de Edward S. King; ''The Journal of the royal Astronomical society of Canada'')]
* {{en}} [http://adsabs.harvard.edu/full/1919ApJ....50..233B Edward Charles Pickering, (de Solon I. Bailey; ''The Astrophysical Journal'')]
* {{en}} [http://infomotions.com/etexts/gutenberg/dirs/1/5/6/3/15636/15636.htm "The Future of Astronomy"; verko de E. C. Pickering] {{Webarchiv|url=https://web.archive.org/web/20120114082704/http://infomotions.com/etexts/gutenberg/dirs/1/5/6/3/15636/15636.htm |date=2012-01-14 }} en "[[Project Gutenberg]]"
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