TY  - BOOK
AU  -  flag , W.
AU  -  Nagar , B.
AU  -  Sochtig, H.
AU  - Tietjen, C.
TI  - Organic Materials and Soil Productivity
U1  - 631.4 FLO 
PY  - 1977///
CY  - Rome : 
PB  -  Food and Agriculture Organization of the United Nations
KW  - Soil science
ER  -