Triplanetary

From Author Wars - https://authorwars.com/publications/triplanetary-554601.html

Overview:

Title: Triplanetary
Author: E. E. 'Doc' Smith
Year: 1973
ISBN-10: 0586037608
Publisher: Panther
Price: £0.35
Pages: 254
Binding: Paperback
Type: Novel
Title Reference: Triplanetary
Notes:
'First published in Great Britain by W. H. Allen & Co. Limited in 1971'.
Published in 1972 by Panther Books , reprinted in 1972, 1973.
Artist not credited, but cover is the same as for 1977 Panther printing, where the identification is explained.
'Australia & New Zealand $1,10, Singapore $3.50, Canada $1,25, South Africa 85c'.