Urvoy, Yves Francois Marie Aime. <br/><br/>
Les bassins du Niger :  etude de geographie physique et de paleogeographie. 

 - Paris :  Larose,  1942. 
 - Memoires de l'Institut francais d'Afrique noire ;  no. 4 .
<br/><br/> At head of title: Y. Urvoy.  Errata slip inserted.  Issued also as thesis, Univ. de Paris. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Physical geography -- Niger River Valley.--Physical geography -- Niger River Valley.<br/>Paleogeography.