Earth (1962; revised 1963), by Arthur Beiser
*The Universe (1962; revised 1966, 1967), by David Bergamini
*The Insects (1962), by Peter Farb
*The Birds (1963), by Roger Tory Peterson
*The Plants (1963; revised 1968), by Frits W. Went
*The Mammals (1963; revised 1967), by Richard Carrington