Notes: Second Sphere Books printing ("Reprinted July 1972"). "Sphere Science Fiction Classics" series but not numbered. Page numbers switch from Roman numerals to Arabic without resetting, i.e. introduction is vii-xiii, 2 pages later novel starts at P15. Other prices: Australia $1.00, NZ $1.00, South Africa $0.75, East Africa 7/25. Artist not credited but signature is readable.