TY  - BOOK
AU  - H.M.S.O.
TI  - Soil Potassium & Magnessium (Tech. bull. 4)
U1  - 631.83+631.4:546.46   K7 
PY  - 0000///London
CY  - 1967
PB  - H.M.S.O.
ER  -