TY  - RPRT
TI  - Fly ashes in cements and concretes : technical needs and opportunities
AU  - Frohnsdorff, G
AU  - Clifton, J R
PY  - 1981
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 81-2239
DO  - 10.6028/NBS.IR.81-2239
ER  -