TY  - RPRT
TI  - Letter Circular 401: railway track scale testing service of the National Bureau of Standards fiscal year July 1, 1932 to June 30, 1933
PY  - 1933
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 401
DO  - 10.6028/NBS.LCIRC.401
ER  -