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De Morgan, Augustus in author 
1840-1849::1846::07 in date 
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Herschel6952

From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[21 July 1846]
Source of text:
RS:HS 6.229
Summary:

By which of JH's photographic processes can drawings be made permanent? Hopes printing goes on well.

Contributor:
John Herschel Project
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