Mainline Progress A and B. Teacher s book.- Alexander, L. G.

Longman. 1974. English language, Textbooks for foreign speakers., grammar 22cm. [5],217p,[6] leaves : ill., music. Encuadernación en tapa blanda de editorial ilustrada. Idioma Inglés. [by] L. G. Alexander. New concept English. Index. L. A and B, Teacher s book. Includes index . Cubierta deslucida. ISBN: 0582519489 (Pbk)