TY  - BOOK
AU  - Van Olphen H
AU  -  Fripiat J J Ed.
TI  - Data handbook for clay meterials and REF non-metallic minerals
U1  - H1195g, L9 
PY  - 1979///
CY  - Oxford
PB  - Pergamon Press        
KW  -  Nonmetallic
KW  - Geology
ER  -