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- The new Cambridge English course : practice - upper-intermediate + key. 4 / Desmond O'Sullivan, Michael Swan, Catherine Walter . Cambridge : Cambridge University Press, 1993 . 167 s. [2, currently available 2]
- The new Cambridge English course : practice - intermediate + key. 3 / Desmond O'Sullivan, Michael Swan, Catherine Walter . Cambridge : Cambridge University Press, 1992 . 128 s. [2, currently available 2]
