TY  - BOOK
AU  - Velde, B.
TI  - Introduction to clay minerals: :Chemistry, origins, use and environmental significance
U1  - 549.6 
PY  - 1992///
CY  - London
PB  - Chapman & Hall
KW  - Clay minerals chemistry
KW  - Environmental aspects-clay minerals
KW  - Origin of clays
KW  - clays in environment
ER  -