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Perfins

History of J. Sloper & Co.'s Stamp Security Service, A. London: J. Sloper & Company. 16 pp.

BEER, Burkhart & Maurice HARP. Pilfering, Protection and Perfins: An Aspect of the Line-Engraved Twopence. Dsseldorf, Germany: Briefmarkenfreunde Dsseldorf, 1996.

EDWARDS, T. A. & B. C. LUCAS. G.B. Official Perfins. Northwood, Middlesex: The Perfin Society, 1984. 69 pp.

EDWARDS, Tony. Tomkins Catalogue of Identified G.B. Perfins, The. 1985. 167 pp.

GAULT, Roy. Perfin Society Catalogue of G.B. Perfins - Illustrated Catalogue Updates 1993, The. The Perfin Society, 1993.

--- Perfin Society Catalogue of Sloper's Wartime Provisionals, The. 1992.

--- Tomkins Catalogue of Identified GB Perfins, The. 7th edition. The Perfin Society, 1993.

HAMILL, Ian; Kevin PARKHILL, Stephen STEERE & Roy GAULT. Perfin Society Illustrated Handbook of GB Perfins - Hospital Dies, The. The Perfin Society, 1993. 28 pp.

NELSON, John. Catalogue of Perfins 1924-1925 British Empire Exhibition Stamps. The Perfin Society, 1993. 16 pp.

NELSON, John S. Handbook of British Perfins, The. 1st edition. Westerham: John S. Nelson, 1967. 30 pp.

--- Handbook of British Perfins, The. 3rd edition. Northwood, Middlesex: Perfin Society, 1988. 30 pp.

THORNTON, Mary E. Catalogue of Official Perfins. Section 1, Great Britain. London: The Great Britain Philatelic Society, 1967. 16 pp.