TY  - RPRT
TI  - Letter Circular 827: sunlamps, therapeutic lamps; ultraviolet and infrared lamps (supersedes Letter Circular 631)
PY  - 1946
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 827
DO  - 10.6028/NBS.LCIRC.827
ER  -