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Encke, Johann Franz in correspondent 
Herschel, John in addressee 
1840-1849::1840::03 in date 
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From:
Johann Franz Encke
To:
Sir John Herschel
Date:
[20 March 1840]
Source of text:
RS:HS 7.92
Summary:

Comments extensively on the orbits of recent comets.

Contributor:
John Herschel Project