They published a couple of original papers: https://en.wikipedia.org/wiki/Nicolas_Bourbaki#Articles https://en.wikipedia.org/wiki/Nicolas_Bourbaki#Articles I a

They published a couple of original papers: https://en.wikipedia.org/wiki/Nicolas_Bourbaki#Articles https://en.wikipedia.org/wiki/Nicolas_Bourbaki#Articles I assume they were lacunae in the literature that came up while writing the books, but Wikipedia doesn't explain.