TY  - JOUR
CN  - I 28.140:
CN  - HD9590.4
CY  - Washington, D.C. :
ID  - 154633
KW  - Clay industries
N1  - Description based on: 1979 prelim.; title from caption.
PB  - U.S. Dept. of the Interior, Bureau of Mines,
PP  - Washington, D.C. :
T1  - Clays in ...
TI  - Clays in ...
ER  -