TY  - BOOK
AU  - Kumada, Kyoichí.
TI  - Chemistry of soil organic matter
T2  - Developments in soil Science
U1  - 631.43 
PY  - 1987///
CY  - Amsterdam
PB  - Elsevier
KW  - Humus
KW  - Suelos
KW  - Materia orgánica
ER  -