TY  - RPRT
TI  - Improved coal interface detector 
AU  - Roe, Keith C
AU  - Wittmann, Ronald C
PY  - 1982
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 82-1663
DO  - 10.6028/NBS.IR.82-1663
ER  -