TY  - RPRT
TI  - A procedure for tristimulus color measurements on building stone 
AU  - Knab, Lawrence I
PY  - 1984
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 84-2961
DO  - 10.6028/NBS.IR.84-2961
ER  -