TY  - BOOK
AU  - Williams Martin A J Ed.
AU  -  Adamson D A Ed.
TI  - Land between tow niles :  Quaternary geology and biology of the Central Sudan   
U1  - U671(J).678.N7, M2 
PY  - 1982///
CY  - Netherland
PB  - A A Balkema        
KW  - Geography
ER  -