The item that intrigues me is this:

"...multiple drafts of teleplays for two episodes of The Planet Tschai, "Episode 3: The Dirdir" and "Episode No. 4: The Pnume."

I don't think I have ever heard of a Tschai TV project. Nor do I think Jack would have written these without some kind of offer/contract. And where are Episodes 1 and 2?