TY  - RPRT
TI  - Circular of the Bureau of Standards no. 91 2nd edition: United States government specification for ocher, dry and paste
PY  - 1922
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 91e2
DO  - 10.6028/NBS.CIRC.91e2
ER  -