TY  - RPRT
TI  - Circular of the Bureau of Standards no. 333: specifications for the manufacture and installation of two-section, knife-edge railroad tack scales
PY  - 1927
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 333
DO  - 10.6028/NBS.CIRC.333
ER  -