TY  - RPRT
TI  - Circular of the Bureau of Standards no. 574: amplitude and phase curves for ground-wave propagation in the band 200 cycles per second to 500 kilocycles
AU  - Wait, James R
PY  - 1956
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 574
DO  - 10.6028/NBS.CIRC.574
ER  -