TY  - BOOK
AU  - GILBERT H COLLINGS
TI  - COMMERCIAL FERTILIZERS, THEIR SOURCES AND USE
U1  - GN631.8C692C5 
PY  - 1954///
CY  - LONDON
PB  - McGRAW-HILL BOOK COMPANY, INC.
KW  - COMMERCIAL FERTILIZERS, THEIR SOURCES AND USE
ER  -