Salt, Laura E. <br/><br/>
Oxford junior encyclopaedia / 
by Laura E. Salt 
 - London :  Oxford University Press,  1949. Oxford :  Oxford University Press,  1974. London :  Oxford University Press,  1955. London :  Oxford University Press,  1954. London :  Oxford University Press,  1952. London :  Oxford University Press,  1953. London :  Oxford University Press,  1950. 
<br/><br/> V.3, engineering 
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