Explorations - Yeats, W. B. (William Butler) 1865-1939. (New York Macmillan, 1962)
Explorations I -- The Irish dramatic movement: 1901-1919 -- Explorations II -- Pages from a diary written in nineteen hundred and thirty: 1944 -- From Wheels and butterflies: 1934 -- From On the boiler: 1939.