TY  - RPRT
TI  - Letter Circular 814: revised classification of radio subjects used in National Bureau of Standards (supersedes Circular 385)
PY  - 1946
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 814
DO  - 10.6028/NBS.LCIRC.814
ER  -