Wolfram Research

On the Nature of Things

On the Nature of Things, by Lucretius

An Inquiry into the Nature and Causes of the Wealth of Nations

Plaintext for Adam Smith's "The Wealth of Nations"

Sample Image: Orange Butterfly on a Purple Flower

Sample Image of a Butterfly

On the Origin of Species

On the Origin of Species By Means of Natural Selection, or, the Preservation of Favoured Races in the Struggle for Life, by Charles Darwin