TY  - RPRT
TI  - Letter Circular 450: railway track scale testing service of the National Bureau of Standards fiscal year 1935 (July 1, 1934 to June 30, 1935)
PY  - 1935
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 450
DO  - 10.6028/NBS.LCIRC.450
ER  -