Autobiography

The History of the Decline and Fall of the Roman Empire

The French Revolution

The American Crisis

The Economist

The Light That Failed

The Positive Outcome of Philosophy / The Nature of Human Brain Work. Letters on Logic

The Seven Great Monarchies Of The Ancient Eastern World, Vol 5: Persia / The History, Geography, And Antiquities Of Chaldaea, Assyria, Babylon, Media, Persia, Parthia, And Sassanian or New Persian Empire; With Maps and Illustrations

The Crisis — Complete

The World's Greatest Books — Volume 04 — Fiction

Biology / A lecture delivered at Columbia University in the series / on Science, Philosophy and Art November 20, 1907