Lot of 6 Science Fiction Novels: Heinlein, Vonnegut, Silverberg, Piper, etc.
THE ALIEN YEARS - Written by Robert Silverberg. ISBN: 006105111x. Published by HarperCollins. SLAUGHTERHOUSE-FIVE - Written by Kurt Vonnegut. ISBN: 0440180295. Published by Dell. No pen/pencil markings; clean.