TY  - BOOK
AU  - Velde,B.
TI  - Clay minerals: a physico-chemical explanation of their occurrence 
SN  - 0444424237 (U.S.) :
AV  - QE389.625 .V43 1985
U1  - 549/.6�19 
PY  - 1985///
CY  - Amsterdam
PB  - Elsevier
KW  - Clay minerals
ER  -