Wyndham, Stapledon and Lem

Sirius by Olaf Stapledon — Sirius by Olaf Stapledon, The Invincible by Stanislav Lem

Bought a couple of books.

The Chrysalids by John Wyndham (Penguin Books 1974)
The Kraken Wakes by John Wyndham (Penguin Books 1968)
Sirius by Olaf Stapledon (Penguin Books 1972)
The Invincible by Stanislav Lem (Penguin Books 1976)