books.google.frhttp://books.google.fr/books/about/A_Specimen_of_Printing_Types.html?hl=fr&id=4-pbAAAAQAAJ&utm_source=gb-gplus-shareA Specimen of Printing Types
Cast at Bell & Stephenson's Original British Letter Foundry, from Punches and Matrices Executed Under Their Direction. By William Colman, Regulator, and Richard Austin, Punch-cutter(Livre numérique Google)
A Specimen of Printing Types: Cast at Bell & Stephenson's Original British Letter Foundry, from Punches and Matrices Executed Under Their Direction. By William Colman, Regulator, and Richard Austin, Punch-cutter
