Children of Dune
Parts of "Dune Messiah" and "Children of Dune" were written before "Dune" was completed. "Children of Dune" was originally serialized in "Analog Science Fiction and Fact" in 1976, and was the last "Dune" novel to be serialized before book publication. "Dune Messiah" and "Children of Dune" were published in one volume by the Science Fiction Book Club in 2002.