TY  - BOOK
AU  - Bear, Firman E.
ED  - American Society of Agronomy. Madison, Wis.
ED  - National Fertilizer Association.
TI  - Hunger signs in crops; a symposium, prepared
U1  - 581.21 
PY  - 1949///
CY  - Washington, D.C.
PB  - American Society of Agronomy
KW  - Plantas
KW  - Deficiencias nutritivas
KW  - Nutrición
ER  -