Where to find F. Riesz collected papers? In Rota's Ten lessons I wish I had been taught, under the section Publish the same result several times, he mentions F. Riesz collected papers; any ideia on where to find them?

Marcel Riesz was Frederick (Frigyes) Riesz's younger brother. "Ten lessons I wish I had been taught" is a chapter of the book "Indiscrete Thoughts" in which both of their works and collected papers are mentioned and talked about together. It turns out, that one of the "Collected Papers" books that is mentioned is a book that is possibly both of their combined works. However, apparently some of the collected works in this book had been not included in certain editions, as the editors chose not to include them.
While it's almost difficult to locate a specific book by Frederick Riesz that's easily accessible, here is a collection of his published works as documented by the Open Library, of which possibly where the ones that were compounded into the one original big book in the past. In addition, WorldCat has this list of his books.
