The roots of coincidence;

By Koestler, Arthur . London : Right Book Club,

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Darkness at noon /

By Koestler, Arthur, 1905-. London : Cape, 1965 , First published in 1940.

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By Koestler, Arthur, 1905-. London : Pan Books Ltd., 1967 , Includes index.

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By Koestler, Arthur, 1905-. London : J. Cape, 1945

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By Koestler, Arthur, 1905-. London : Heinemann, 1961 , "From The sleepwalkers."

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By Koestler, Arthur, 1905-. [London] : Pan Books, 1974

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By Koestler, Arthur, 1905-. London : Hutchinson, 1959

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