TY  - JOUR
T1  - Perlite in ...
CY  - Washington, D.C. :
CN  - I 28.133:
CN  - Discard
PB  - U.S. Dept. of the Interior, Bureau of Mines,
PP  - Washington, D.C. :
N1  - Description based on: 1979 prelim.; title from caption.
ID  - 160002
KW  - Perlite industry
TI  - Perlite in ...
ER  -