TY  - RPRT
TI  - Circular of the Bureau of Standards no. 421: Spectral-transmissive properties and use of colored eye-protective glasses
AU  - Coblentz, W W
AU  - Stair, R
PY  - 1938
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 421
DO  - 10.6028/NBS.CIRC.421
ER  -