This volume collects the most substantial correspondence and documents relating to Wittgenstein's long association with Cambridge between the years 1911 and his death in 1951, including the letters he exchanged with his most illustrious Cambridge contemporaries Russell, Keynes, Moore, and Ramsey (and previously published as Cambridge Letters). Now expanded to include 200 previously unpublished letters and documents, including correspondence between Wittgenstein and the economist Piero Sraffa, and between Wittgenstein and his pupils Includes extensive editorial annotations Provides a fascinating and intimate insight into Wittgenstein's life and thought