TY  - BOOK
AU  - Kumada, Kyoichi
TI  - Chemistry of soil organic matter
T2  - Development in soil science
SN  - 4762205346
AV  - S592.8 K85
PY  - 1987///
CY  - Tokyo
PB  - Japon scientific societies ; amsterdam, Elsevier
KW  - Humus
KW  - Ácido húmico
ER  -