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(1)
Caf>fJt/X, 3. «(-
A METHOD
OF
CONVERTmG COLLODION NEGATIVES
INTO POSITIVES, BY HEAT.
JOHN F. CAMPBELL, Esij.
EXTRACTED FROM THE LIVERPOOL AND MANCHESTER
PHOTOGRAPHIC JOURNAL.
LIVERPOOL:
HENRY GREENWOOD, PRINTER, 32, CASTLE STREET.

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