Right now I'm listing to a Niven/pournell 1977 book
but I've just finished about 4 Robert A. Heinlein books in a row... all around the 1950's with stories based on the future being late 70's to the year 2000.
Pretty funny listening really. though they're not meant to be.
yeah RAH is an interesting one... some of his stuff is just plain wrong. One time his character cloned himself into little girls, then another he went back in time to have sex with his mother (when she was a hotty)...