TY  - BOOK
AU  - Bolt, G H  .
AU  - Bruggenwert,M G M  .
TI  - Soil chemistry: Basic elements / 
SN  - 0-444-41435-5
U1  - 631.41 
PY  - 1981///
CY  - New York : 
PB  - Elsevier Scientific Publishing Company , 
ER  -