TY  - BOOK
AU  - Richards, B. N.
TI  - Introduction to the soil ecosystem
SN  - 0582441307
U1  - 631.46 
PY  - 1974///
CY  - London
PB  - Longman
KW  - Suelos
KW  - EcologÃ­a
KW  - MicrobiologÃ­a
ER  -