TY  - BOOK
AU  - National conference on clays and clay minerals(6th: 1957, Au
TI  - Clay and clay minerals
PY  - 1959///
CY  - Pergamon
PB  - London
UR  - http://14.139.222.13:80/cgi-bin/koha/opac-detail.pl?biblionumber=3043
ER  -