TY  - BOOK
AU  - Samuel L. Tisdale
AU  -  Werner L. Nelson, 
TI  - Soil fertility and fertilisers
U1  - 631.8 
PY  - 1956///
CY  - New york
PB  - Macmillian Co.
N1  - Samuel L. Tisdale & Werner L. Nelson: Soil fertility and fertilisers.  New york.  Macmillian Co., 1956.--(631.8TIS)
ER  -