TY  - RPRT
TI  - Letter Circular 315: railroad track scale testing service of the National Bureau of Standards fiscal year July 1, 1930 to June 30, 1931
PY  - 1932
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 315
DO  - 10.6028/NBS.LCIRC.315
ER  -