Originally published: As 'An age', London : Faber, 1967 ; and as 'Cryptozoic', Garden City, N.Y. : Doubleday, 1968 ; London : Sphere, 1973.
Cryptozoic by Brian W. Aldiss. ISBN 0586049924. Published by Panther in 1979. Publication and catalogue information, links to buy online and reader comments.