Davis, Polly <br/><br/>
English structure in focus. Teacher's manual / 
Polly Davis 
 - Rowley, Mass. :  Newbury House Publishers,  1977 
 - 65p. :  22 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English language--Text--Books for foreigners<br/>English language--Programmed instruction