Superman (1939-) #308
It’s weird the digital library doesn’t have the issue after this one. Issues 307-309 are a three part story arc… a good one too for a Bronze Age Superman tale. But for some reason they have the first two parts but not the third. Now I know this is what is in the digital library so in no way blaming DC Universe for this, they put up all they could. But I wonder what the train of thought for this was, especially since I am guessing anyone who bought the first two parts on Comixology felt cheated they were left hanging on such a perplexing cliffhanger.