TY  - RPRT
TI  - Circular of the Bureau of Standards no. 15 3rd edition: the international unit of light
PY  - 1911
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 15e3
DO  - 10.6028/NBS.CIRC.15e3
ER  -