*Longman Structural Readers* are graded in six Stages according to the following principles: 1. The structures of the language are introduced in the same order as in the majority of modern course books. 2. The vocabulary is controlled as in other series, with the important development that words required for special purposes are included freely by a prescribed process of repetition. The *Handbook to Longman Structural Readers* explains these principles in detail. This book contains three episodes from the BBC television series **Doomwatch**

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