Natelson did not take the ABA Report into his research, and I say this because there is no mention of it in his endnotes. It's understandable because the ABA Report is not available on the Net. Bill Walker got it in hard copy from the ABA, laboriously keyed it into his brief, and I had it only because of the editing work I did for Walker. Natelson probably doesn't know it exists. It exists on FR only because I saved it from my effort with Bill.
Prof Natelson is a very gracious man, and I'm sure he would kindly receive a copy of the work you mention. Over the years, I've asked him an email question or two, and he has always graciously answered. I'm really amazed, actually. He seems a very kind man. I wouldn't want to wear it out, but just wanted to report that he is accessible.