David I Greenhalgh. Published by Galata Print Ltd., Llanfyllin. 2010.  PB (laminated card covers)  A4 (210 x 297mm) 174 pages, illustrated throughout with b&w lifesize photographs and enlargements. Mints covered: London, Bristol, Calais, Canterbury, Coventry, Norwich and York.  Previously unpublished types and varieties are included. It includes a concordance with all major reference works relating to half groats.
Includes appendices on forgeries, alterations, reproductions and electrotypes.
Includes a handy 'roadmap' style introduction to the identification of types.

This is the definitive guide to medieval half groats.  Useful for all collectors from the absolute beginner to the most advanced researcher.
  Illustrated with enlarged photographs.