Reviews to be posted in the new few weeks include:

Encyclopedias of the Enlightenment
– there are several; this batch enables a typical French academic reference to be compared with a volume for the US college market.

Dictionnaire de la pensée de Voltaire
You ask yourself why more reference works are not compiled on this principle: reasonable-length extracts from a prolific author, enabling the reader to see what Voltaire said on a number of key topics. Perhaps every major author should have such a dictionary.