What’s a book from the ‘50s that doesn’t get enough attention and praise?

Early 1900s:
'Last and First Men' – Olaf Stapledon. One of the great 'future histories' of humanity.
Also its spiritual sequel 'Star Maker', and 'Sirius' (also by Stapledon).
'The Machine Stops' – EM Forster…

1940 – 1949:
Kallocain by Karin Boye
"The Heart is a Lonely Hunter" by Carson McCullers
AJ Cronin: the Keys of the Kingdom…

1950 – 1959: