TY  - RPRT
TI  - Precision measurement and calibration : selected NBS papers on radiometry and photometry
AU  - Hammond, H K, III
AU  - Mason, H L
PY  - 1971
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS SP 300v7
DO  - 10.6028/NBS.SP.300v7
ER  -