Typescript Ts-201a1, Notes on Logic (1913): This variant of the so-called Russell version of the "Notes on Logic" is kept at the Bertrand Russell Archives at McMaster University, Canada. The group of items which form Ts-201a consists of a dictation and recorded conversation with Russell (Ts-201a1), a unified typescript (Ts-201a2), and a later typescript (Ts-201a3) which is closest to the text published in 1979. -- Ts-201a1 starts with a title page and consists of two sections on 34 loose typescript sheets; the first typed (pages A1-A7), the second handwritten (pages B1-B26).

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