This edition was made by the simple act of binding together the July 1978 NEL edition of _Empire of the Atom_ (
here) and the February 1979 NEL edition of _The Wizard of Linn_ (here) without any interior modifications.
The ISBN, on front cover only, by numerical sequence only puts the date in October 1981, amazon.uk has the month as December
Separate numbering for each novel (both parts retain their individual copyright pages).
The cover is a composite of the concerned editions' ones and so is by Petagno overall.
OCLC has no record for the ISBN or combined edition in any form
