TY  - BOOK
AU  - Collings,Gilbeart H.
TI  - Commercial fertilizers, their sources and use.
T2  - Blakiston books on agriculture
U1  - 668.62 23
PY  - 1948///
CY  - Philadelphia , Torondo
PB  - The Blakiston co.
KW  -  Fertilizers
ER  -