BTW, before he gots nuts, L. Ron Hubbard wrote a terrific novel called Fear.
Short stories, especially.. He subscribed to "Astounding Science Fiction" ( now called "Analog" ) magazine, and others, which often didn't last long but had great writers / short stories, novellas, etc..
Other great favorites of mine are E.E. "Doc" Smith, ( "Skylark" series, "Lensman" series ) A.E. Van Vogt, Isaac Asimov, Jules Verne, Andre Norton, Larry Niven, Carl Sagan, H.G. Wells, and many, many others..
I've been lucky enough to have attended 2 World Science Fiction conventions, and enjoy the genre "to the max"..