PROUDHON'S COLLECTED WORKS

What is Property (1840)
Qu'est-ce que la propriété

System of Economical Contradictions: or, the Philosophy of Misery (1846)
(Etext Version from Project Gutenberg) or broken into chapters

General Idea of Revolution (1851)

Proudhon's Solution of the Social Problem (excerpts). Edited by Henry Cohen. Vanguard Press, 1927.

Correspondance de P.J. Proudhon

"Etre Gouverne", from: Idée Générale de la Révolution au XIXe Siècle

A Letter To M. Blanqui. Paris, April 1, 1841.

Interest and Principal: A Loan is a Service, Letter addressed to Frederic Bastiat in The Voice of the People, 1849.

Interest and Principal: The Circulation of Capital, Not Capital Itself, Gives Birth to Progress, Letter addressed to Frederic Bastiat in The Voice of the People, 1849.

Interest and Principal: The Origin of Ground Rent, Letter addressed to Frederic Bastiat in The Voice of the People, 1849.

Interest and Principal: Arguments Drawn from the Operations of the Bank of France, Letter addressed to Frederic Bastiat in The Voice of the People, 1849.

The Philosophy of Progress [pdf]

---

Several letters between Bastiat and Proudhon can be found on the Bestiat site.