TY  - BOOK
AU  - Tisdale, Samuel L.
AU  - Nelson,Warner L  .
TI  - Soil fertility and fertilizers / 
SN  - 0-02-421160-4
U1  - 631.8 
PY  - 1975///
CY  - New York : 
PB  - McGraw Hill Book Company , 
ER  -