TY  - RPRT
TI  - Letter Circular 135: general report of the work of the railroad track scale testing service of the Bureau of Standards July 1, 1923, to June 30, 1924
PY  - 1924
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 135
DO  - 10.6028/NBS.LCIRC.135
ER  -