Berdan, Robert Homer,   1943- <br/><br/>
On the nature of linguistic variation:  [microform] / 
by Robert Homer Berdan. 
 - Ann Arbor, Mich. :  University Microfilms International,  1975. 
 - 1 microfilm reel :  positive ;  35 mm. 
<br/><br/>Thesis (Ph.D.) - University of Texas, 1975. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Linguistics--Methodology.<br/>Language and languages--Variation.