TY  - RPRT
TI  - Electromagnetic noise in Robena no. 4 coal mine 
AU  - Bensema, W D
PY  - 1974
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS TN 654
DO  - 10.6028/NBS.TN.654
ER  -