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: a simple presentation of contemporary knowledge and opinions about fertilizers, manures, and soil fertility
PY  - 1948///
CY  - New York : 
PB  - Chemical publishing, 
KW  - Agronomía
N1  - Bibliogtaphy;: p.347-349
ER  -