Mackin, Ronald. <br/><br/>
Exercises in English patterns and usage :  key to books 1to 5 / 
Ronald  Mackin. 
 - London :  Oxford University Press,  1968. 
 - 40 p. ; 
<br/><br/><label>ISBN: </label>BK1214 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English language-Composition and exercises.-
<br/><br/><label>Dewey Class. No.: </label>428.24  / Ex