TY  - RPRT
TI  - Letter Circular 273: papers on colorimetry from the National Bureau of Standards
PY  - 1926
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 273r1929
DO  - 10.6028/NBS.LCIRC.273r1929
ER  -