Well, my challenged organizational ability has been rescued once again by my wife, who has found the files. I am amazed at my good sense in giving the stuff to her so it wouldn't get lost.
I think that Arnold Gassan's "Dialog That Failed" (as I recalled the title) must have been posted by Mr. Gassan online. I just searched and found that it has been published under the title "Dialog Failed" in various forms but is out of print. It can be found and purchased. I suspect that I read the text online, because we can't find it here. What I do have, however, is the "Minor White Denver Workshop Reports" that was prepared by Mr. Gassan. It is about 40 pp. long. There is a lot of "meat" in it.
In addition, there is a lot of other material. I guess I'd better get to reading.