TY  - RPRT
TI  - Circular of the Bureau of Standards no. 186 2nd edition: United States government master specification for ribbons, typewriter
PY  - 1927
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 186e2
DO  - 10.6028/NBS.CIRC.186e2
ER  -