TY  - RPRT
TI  - Average radio ray refraction in the lower atmosphere 
AU  - Schulkin, M
PY  - 1947
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CRPL 2-2
DO  - 10.6028/NBS.CRPL.2-2
ER  -