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Georgetown College Observatory D. C. ).

Georgetown College Observatory D. C. ).

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1.
The Photochronograph and Its Applications
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AED82
Binding:
Paperback
Release:
28 Jan 2013
Language:
English
International Edition
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3.
Sun-spot Drawings Made At The Georgetown College Observatory In 1850, September 20 To November 6
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Photographic Transits Of One Hundred And Sixty-one Stars
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