TY  - BOOK
AU  - Duval Guy
TI  - Methodological approach for the retrospeetive diao
T2  - United nations Research Institute for Social Development, Food systems monographs
U1  - L:46.74.N8, M6/UN 
PY  - 1986///
CY  - Geneva
PB  - UN          
KW  - Medicine
ER  -