TY  - BOOK
ED  - International Potash Institute.
TI  - Transition from extensive to intensive agriculture with fertilisers: proceedings of the 7th Colloquim of the International Potash Insti tute held in Israel, 1969
U1  - 631.81 
PY  - 1969///
CY  - Berne, Switzerland
KW  - Fertilizers and manures
KW  - Congresses
N1  - Includes bibliographical references
ER  -