TY  - BOOK
ED  - United States.
TI  - The microflotation of silica
U1  -  628.1683 
PY  - 1972///
CY  - Washington, D.C.
PB  - The Department
KW  - Acid mine drainage
KW  - Coal mine waste
KW  - Manufacturing wastes
KW  - Prevention
N1  - Report no. 756
ER  -