Colin Michael Langston

• Great Britain catalogue of surcharge and explanatory dies
• Great Britain Queen Elizabeth stamps issued in sheets, 1952-1966, photogravure issues only
• Great Britain Queen Elizabeth stamps issued in sheets, 1952-1966, photogravure issues only: a complete study including details of all known constant flaws
• Stamps of Great Britain issued in rolls and the machines which use them
• The complete list of flaws on Queen Elizabeth Great Britain (1st. design) stamps from booklets and coils