Hughes and Son, Principality Press, Wrexham Ychwanegu i'r clipfwrdd LHA5/1 Ffeil 1924, 1929-1936 Rhan oUniversity of Wales Archive Principality Press
Hughes and Son: proposed arrangements for a joint scheme of publication Ychwanegu i'r clipfwrdd LHA5/2 Ffeil 1925-1926 Rhan oUniversity of Wales Archive Principality Press