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Address S.D.HUMPHREY Office, 37 Lispenard Street, NEW YORK.
THE PRACTICAL MANUAL OF THE COLLODION PROCESS.
BY S.D.HUMPHREY.
THIRD EDITION This Edition contains all the Improvements in the Art made public up to the day of publication, and gives complete Practical Instructions for making Collodion Positives or Ambrotypes, Collodion Negatives, Printing, etc., etc.