TY - RPRT TI - Letter Circular 482: railway track scale testing service of the National Bureau of Standards fiscal year 1936 (July 1, 1935 to June 30, 1936) PY - 1936 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - LCIRC 482 DO - 10.6028/NBS.LCIRC.482 ER -