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Harbord, John Bradley in correspondent 
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From:
John Bradley Harbord
To:
Sir John Herschel
Date:
n.d.
Source of text:
Harvard: Houghton
Summary:

Proposes the distinguishing terms for types of navigation: 'geo-navigation' and 'celo-navigation.'

Contributor:
John Herschel Project
Collection
Document type
Transcription available