This is an archived course. A more recent version may be available at ocw.mit.edu.
Gottlob Frege, Stanford Encyclopedia of Philosophy
Frege's Logic, Theorem, and Foundations for Arithmetic, Stanford Encyclopedia of Philosophy
Bertrand Russell, Stanford Encyclopedia of Philosophy
Writings by Bertrand Russell: Electronic Texts on the WWW (Writings by Russell: electronic texts)
George Edward Moore, Stanford Encyclopedia of Philosophy
Ludwig Wittgenstein, Stanford Encyclopedia of Philosophy
Papers of Ludwig Wittgenstein (1889-1951), Philosopher (Wittgenstein's papers at Trinity College, Cambridge)