SF isn't a genre; SF is the matrix in which genres are embedded, and because the SF field is never going in any one direction at any one time, there is hardly a way to cut it off.

Another round of books just read.Some are from the same thrift store find but there are a few others in here too now.

John Boyd - The Rakehells Of Heaven (1969)
 

Robert Conquest - A World of Difference (1955)

Larry Niven - The Long ARM of Gil Hamilton (1976)

Frederik Pohl  - In The Problem Pit (1976)