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Penny, W. G. in correspondent 
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From:
W. G. Penny
To:
Sir John Herschel
Date:
1857
Source of text:
RS:HS 14.153
Summary:

Sends a copy of his Astronomical Investigations. Claims there is an 'inequality in the motions of Mars and the Earth.'

Contributor:
John Herschel Project
Document type
Transcription available