'Earth's last fortress ; and, The three eyes of evil' originally published: in 1 vol. as 'The three eyes of evil ; and, Earth's last fortress', London : Sidgwick and Jackson, 1973. 'Earth's last fortress' originally published: New York : Ace Books, 1960.
'Three eyes of evil' originally published: as 'Siege of the unseen', New York : Ace Books, 1959.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Earth's last fortress ; and, The three eyes of evil by A. E. Van Vogt. ISBN 0722187327. Published by Sphere in 1977. Publication and catalogue information, links to buy online and reader comments.
