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Buttle J W, Beckett P & Daniels D J. (1966). Chemistry: A unified approach. : .
Buttle J W, Beckett P and Daniels D J. 1966. Chemistry: A unified approach. : .
Buttle J W, Beckett P and Daniels D J. (1966). Chemistry: A unified approach. : .
Buttle J W, Beckett P and Daniels D J. Chemistry: A unified approach. : . 1966.