Duangduen Yuvahongs Suwattee,  1938- <br/><br/>
A linguistic analysis of difficulties in the English verbal system encountered by native speakers of Thai / 
Duangduen Yuvahongs Suwattee 
 - 1 microfilm reel :  positive ;  35 mm. 
<br/><br/>Thesis (Ph.D.) - University of North Carolina, 1971 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English language--Verb.