TY  - GEN
AU  - Walls, HJ
C2  - , National Institute of Standards and Technology, Gaithersburg, MD
DA  - 1923-01-01 05:01:00
DO  - https://doi.org/10.6028/NBS.LCIRC.92
LA  - en
PB  - , National Institute of Standards and Technology, Gaithersburg, MD
PY  - 1923
TI  - Letter Circular 92::radio signals of standard frequency and their utilization
ER  -