Collection complète des oeuvres de J.J. Rousseau ...
Contributors: Du Peyrou, Pierre Alexandre, editor
Published: 1780
Place of publication: Genève
Language: fre
Notes: Ed. by P.A. Du Peyrou.

According to Bibliothèque nationale. Dept. des imprimés. Catalogue des oeuvres de J.J. Rousseau, there should be three supplementary volumes.