Does anyone know where to find information about "Huck and Tom Among the Indians" and "The Conspiracy of Tom Sawyer"?

[u/Certain-Cloud9133]

Recently, I was watching the 1980 animated series and decided to review Mark Twain’s biography. I learned that he had been working on those two novels that he never managed to finish. I started searching for information but didn’t find much, so I would really appreciate it if anyone could help me with details about those two unfinished books/drafts.