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Erman, Georg Adolph in addressee 
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From:
Sir John Herschel
To:
Georg Adolph Erman
Date:
[12 October 1870]
Source of text:
RS:HS 25.7.7
Summary:

Corrects a misunderstanding about the date to which magnetic observations are to be reduced.

Contributor:
John Herschel Project
Document type
Transcription available