Berra, Tim M. "Evolution and the Myth of Creationism" (Stanford: Stanford University Press, 1990). A concise, readable 200-page guide to the theory of evolution and some of the creationists' common objections. A good reference for the non-scientist.
Gould, Stephen Jay. "Bully for Brontosaurus: Reflections in Natural History" (New York: Norton, 1991), and "Dinosaur in a Haystack: Reflections in Natural History" (New York: Harmony Books, 1995). Both of these books by the popular Harvard paleontologist give the reader a digestible dose of sophisticated evidence supporting evolutionary theory, and the attempts by religious fundamentalists to twist that evidence to support their own claims. "Bully for Brontosaurus" in particular provides a revealing history of the objections raised by anti-evolutionists.
Cole, Joanna. "The Human Body: How We Evolved" (New York: William Morrow and Co., 1987). Traces the development of humans from early prehistoric ancestors to the modern-tool user who walks upright. 3rd grade and up.
Sattler, Helen Roney. "Hominids: A Look Back At Our Ancestors" (New York: Lothrop, Lee & Shepard, 1988). Describes through line drawings and text the various hominids which preceded homo sapiens, as deduced from fossil remains. 5th grade and up.
Stein, Sara. "The Evolution Book" (New York: Workman Publishing Co., 1986). A 390-page book bursting with experiments, investigations, projects, and pictures that show readers how to unlock the wonders of nature and evolution. 5th grade and up.