TY  - RPRT
TI  - Letter Circular 882: revised classification of radio subjects used in National Bureau of Standards (supersedes Letter Circular 814)
PY  - 1947
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 882
DO  - 10.6028/NBS.LCIRC.882
ER  -