Armbruster, Thomas Edward <br/><br/>
The psychological reality of the vowel shift and laxing rules  [microform] / 
by Thomas Edward Armbruster 
 - Ann Arbor, Mich. :  University Microfilms International,  1978 
 - 1 microfilm reel :  positive ;  35 mm. 
<br/><br/>Thesis (Ph.D.) - University of California, 1978 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English language--Vowels