TY  - RPRT
TI  - Circular of the Bureau of Standards no. 392: testing of timepieces
AU  - Gould, Ralph Edgar
PY  - 1931
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 392
DO  - 10.6028/NBS.CIRC.392
ER  -