TY - RPRT TI - Letter Circular 237: railroad track scale testing service of the U.S. Bureau of Standards during the fiscal year July 1, 1926 to June 30, 1927 PY - 1927 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - LCIRC 237 DO - 10.6028/NBS.LCIRC.237 ER -