Sime Surgeon, the early draft of Unto Zeor, Forever was published in Ambrov Zeor, serialized, in issues #7, 8, 9, 11, and 12 at about the time the Doubleday hardcover edition was on the shelves. For more background of this story see preface to Sime Surgeon at

See full details in CHRONOLOGY OF THE SIME~GEN UNIVERSE:   This page is regularly updated.