What’s a book from the ‘60s 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,
The Berlin Stories…

1950 – 1959:
The Talented Mr. Ripley, The Price of Salt, Player Piano (Vonnegut), Miss Macintosh, My Darling by Margarete Young, The Adventures of Augie March by Saul Bellow, The Best of Everything by Rona Jaffe…