TY  - BOOK
AU  - Collings, Gilbeart H
TI  - Commercial fertilizers: their sources and use / by Gilbeart H. Collings
U1  - 631.8  
PY  - 1955///
CY  - Bombay: 
PB  - Tata McGraw-Hill Publishing;  
KW  -  Agriculture and Related Technologies
KW  -  Technology (Applied Sciences)
KW  - Fertilizers
ER  -