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2. Salt the Mysterious Necessity;Batterson,1972
3. Cato (234-149 BC), Cato and Varro. Loeb Classical Library, Harvard University Press. pp. 89, 155.
4. Columella (1st century AD). Columella III. Loeb Classical Library, Harvard University Press. p. 327.
5. Doran, G. F. (1917). Art of curing meats. U.S. patent 1,212,614.