TY  - BOOK
AU  - Hopkins, Donald Percy,
TI  - Chemicals humus, and the soil: A simple presentation of contemporary knowledge and opinions about fertilizers, manures, and soil fertility
AV  - S633 H762
PY  - 1957///
CY  - London
PB  - Faber and faber
KW  - Humus
KW  - Fertilizantes
ER  -