In the 1970s, he produced several large collections of classic grand-scale science fiction, under the titles Space Opera (1974), Space Odysseys (1975), Galactic Empires (1976), Evil Earths (1976), and Perilous Planets (1978) which were quite successful.
În anii '70, a realizat câteva culegeri ample de science fiction clasic, sub titlurile Space Opera (1974), Space Odysseys (1975), Galactic Empires (1976), Evil Earths (1976) și Perilous Planets (1978), care au avut succes.