On the Origin of Species By Means of Natural Selection Or the Preservation of Favoured Races in the Struggle for Life
Charles Darwin (1859), 496 pages.
Published amid a firestorm of controversy in 1859, this is a book that changed the world. Reasoned and well-documented in its arguments, it offers coherent views of natural selection, adaptation, the struggle for existence, survival of the fittest, and other concepts that form the foundation of evolutionary theory. Read the full version at Google Books.