TY  - RPRT
TI  - Radiation patterns in the lower ionosphere and Fresnal zones for elevated antennas over a spherical earth 
AU  - Merrill, R G
AU  - Mansfield, W V
PY  - 1962
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS MONO 38
DO  - 10.6028/NBS.MONO.38
ER  -