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- Sedziwój, Michal; French, John (translator) (1650), A new light of alchymie.
- Glauber, Johann Rudolf; French, John (translator) (1651), A description of new philosophical furnaces.
- Agrippa, Heinrich Cornelius; French, John (translator) (1651), Three Books of Occult Philosophy. (this work was published in English with the author identified only as J.F., one of the few extent copies had the initials modified to say J.Freak.)