TY  - RPRT
TI  - Tables for the statistical predication of radio ray bending and elevation angle error using surface values of the refractive index 
AU  - Bean, B R
PY  - 1960
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS TN 44
DO  - 10.6028/NBS.TN.44
ER  -