TY  - RPRT
TI  - Letter Circular 92: radio signals of standard frequency and their utilization
PY  - 1923
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 92r1923
DO  - 10.6028/NBS.LCIRC.92r1923
ER  -