TY  - RPRT
TI  - Circular of the Bureau of Standards no. 333 2nd edition: 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 333e2
DO  - 10.6028/NBS.CIRC.333e2
ER  -