Notes: • "First Orbit edition published in 1976" • No statement of printing, no number line. • The artist is not credited, no visible signature. • The first appendix is titled How We Work and consists of six essays, one by each author. There is only the one title page and the individual essays simply have the author's name as a header. Thus the contents show six essays with the same title. • Though the cover, spine, title page and introduction have Brian W. Aldiss, both of his essays drop the W.. • $1.95 in Canada