TY  - RPRT
TI  - Microwave measurement of coal layer thickness 
AU  - Ellerbruch, Doyle A
AU  - Adams, John W
PY  - 1974
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 74-387
DO  - 10.6028/NBS.IR.74-387
ER  -