TY  - BOOK
AU  - Ministry of Agri, Fisheries & Food,
TI  - Technical Bulletin No. 21 : Trace Elements in Soils and Crops
U1  - 631 
PY  - 1971///
CY  - London
PB  - Her Majestys Stationary Office
KW  - Techniques, equipment & materials
ER  -