TY  - BOOK
AU  - Hopkins, Donald P.
TI  - Chemicals, humus, and the soil; a simple presentation of contemporary knowledge and opinions about fertilizers, manures, and soil fertility
U1  - 631.8 H81C 
PY  - 1956///
CY  - London
PB  - Faber & Faber
KW  - FERTILIZERS AND MANURES
ER  -