Is there any English translation of this Gergonne paper?
"Variétés. Essai de dialectique rationnelle", Annales de Mathématiques pures et appliquées, tome 7 (1816-1817), p. 189-228.
("Varieties. Essay about rational dialectic", By J.D. Gergonne). Between else, in this paper we find the first use of the symbols "C" and "Ɔ", which later evolved into the modern symbols "$\subset$" and "$\supset$", used in set theory and, in older texts, for implication.
You can find it here (PDF link via numdam.org), in French.
If there isn't any, I believe it deserves one. I would certainly do it, if I could.
This question has also been posted on HSM.
Sam Gallagher translated the paper after this question was post. So, now there is a translation! You can find his work here.