From an excellent list, I'm going to hightlight a couple of lesser known works
> Sheckley, Robert "Specialist" in Keyes, N., ed. Contact. 1963, Paperback Library. Proposes the idea that life
in the universe is all specialized by function, except on Earth.
Scheckley's short stories are uniformly excellent.
> Clement, Hal Mission of Gravity. 1962, Pyramid. Life on a massive, rapidly rotating planet. Clement is a
high-school science teacher. . (A new edition of all his stories about this planet was issued in 2002 by
TOR, under the title Heavy Planet.)
> Sheckley, Robert "Specialist" in Keyes, N., ed. Contact. 1963, Paperback Library. Proposes the idea that life in the universe is all specialized by function, except on Earth.
Scheckley's short stories are uniformly excellent.
> Clement, Hal Mission of Gravity. 1962, Pyramid. Life on a massive, rapidly rotating planet. Clement is a high-school science teacher. . (A new edition of all his stories about this planet was issued in 2002 by TOR, under the title Heavy Planet.)
Fantastic book.