TY - RPRT TI - Circular of the Bureau of Standards no. 131: United States government specification for scouring compounds (a) and (b) for floors and soap scouring compound (c ) PY - 1922 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS CIRC 131 DO - 10.6028/NBS.CIRC.131 ER -