TY  - BOOK
AU  - Collings,Gilbeart H.
TI  - Commercial fertilizers,: their sources and use
T2  - Blakiston books on agriculture
AV  - S633 .C69 1947
PY  - 1947///]
CY  - Philadelphia
KW  - Fertilizers
N1  - Bibliography: p. 475-498
ER  -