Old-school economics
Downloadable (PDF), full-text, (relatively) historical economics texts
Adam Smith: An inquiry into the nature and causes of the wealth of nations
Adam Smith: The theory of moral sentiments
David Ricardo: On the principles of political economy and taxation
John Stuart Mill: Utilitarianism
Francis Edgeworth: Mathematical psychics
Irving Fisher: The nature of capital and income
Frank Knight: Risk, uncertainty and profit
Kenneth Arrow: Social choice and individual values
. Also see the rest of the
Cowles Foundation Monographs
Gerard Debreu: Theory of Value