Frans Vermeulen's Concordant. For Vision v2 only. Concordant Reference contains information on 1209 remedies. Each remedy has been updated significantly with modern knowledge about families and botany.
Frans Vermeulen's Synoptic Reference. An easy to understand synopsis of the 500 leading remedies that helps you grasp the 'picture' of each remedy. For Vision v2 only.
Prisma (original edition) for Vision v2 from Frans Vermeulen. Contains a huge amount of information on 500 remedies including the leading symptoms, zoology, folklore, physics, distribution, mythology and any relation to doctrine of signatures.