The 'Correspondence complète de Madame de Graffigny' is now complete!
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The last volume of letters in this 16 volume series from Oxford UP's The Voltaire Foundation has just been published. 

This critical edition includes more than 2,518 mostly unpublished letters from the correspondence of French novelist and playwright, Françoise de Graffigny (1695-1758). 

For more information (including a sample letter), see the OUP website
http://www.voltaire.ox.ac.uk/…/graffigny/graffigny_index.ssi