TY  - RPRT
TI  - Characteristics of the earth-ionosphere waveguide for VLF radio waves 
AU  - Wait, James R
PY  - 1964
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS TN 300
DO  - 10.6028/NBS.TN.300
ER  -