TY - RPRT TI - Circular of the Bureau of Standards no. 261 2nd edition: United States government master specification for rags, cotton, colored, for wiping machinery (sterilized) PY - 1927 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS CIRC 261e2 DO - 10.6028/NBS.CIRC.261e2 ER -