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Aliotta, The Idealistic Reaction against Science (Macmillan).
Bertrand Russell, Our Knowledge of the External World (Open Court Publishing Co.).
Bertrand Russell, The Problems of Philosophy (Home University Library).
A.N. Whitehead, The Principles of Natural Knowledge (Cambridge Press).
G.E. Moore, Ethics (H.U.L.).
W. McDougall, Philosophy (H.U.L.).
A.N. Whitehead, Introduction to Mathematics (H.U.L.).