50 lessons in Sara-Ngambay. 
 50 leçons en Sara-Ngambay  une langue du Tchad de sud  50 lessons in Sara-Ngambay  a language of southern Chad 

 - Preliminary ed. - Ed. liminaire 
 - 3 v.  ill. 
<br/><br/> Office of Education, U.S. Dept. of Health, Education, and Welfare--contract no. OEC 7098-220-3: final report. 
<br/><br/>Bibliography: v. 1, p. XII 
<br/><br/>V. 1  XVI, 230 p. V. 2  P. 231-396 V. 3  120 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Gambai dialect--Textbooks for foreign speakers--English