TY  - RPRT
TI  - Circular of the Bureau of Standards no. 93: recommended specification for iron-oxide and iron-hydroxide paints
PY  - 1920
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 93
DO  - 10.6028/NBS.CIRC.93
ER  -