* http://www.questia.com/read/113240205?title=100%20Most%20Popular%20Scientists%20for%20Young%20Adults%3a%20%20Biographical%20Sketches%20and%20Professional%20Paths (online book)
* http://www.mwoa.org/hale.html
* http://en.wikipedia.org/wiki/George_Ellery_Hale
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