Yeah the daytime serial newsletter would be the only one that would have synopsis from 1975 in such detail (or at all really) Soap Digest started in late 1975 so would most likely have covered the last few months of that year. But any of the daytime serial newsletters from 1972 - 1975 (when it was seriously just a newsletter not a magazine) are hard to come by. In fact that auction was probably one of a kind, as those issues (from other sellers) have been on ebay at $50 a pop. Soap Digest first few issues until about Apr 1976 are hard to come by too, or really expensive.