- found: Work cat.: Durrant, B. The printing processes - letterpress, 1994.
- found: Elseviers' dictionary of the printing and allied industries, 1983 (Relief printing process by means of types, electrotypes, sterotypes, rubber or plastic plates)
- found: Britannica (Letterpress printing)
- found: Cambridge paperback encyclopedia, 1993 (Letterpress printing)
- 1995-02-28: new
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