TY  - BOOK
AU  - Allison,Franklin E.
TI  - Soil organic matter and its role in crop production
U1  - 631.4 
PY  - 1973///
CY  - Amsterdam
PB  - Elsevier Scientific Pub. Co.
KW  - Humus
KW  - Soil science
KW  - Organic farming
ER  -