"Spectrophotometric and Colorimetric Determination of the Colors of the TCCA Standard Color Cards". Journal of the Optical Society of America 36: 128–159. DOI:10.1364/JOSA...
see File:US Flag spec TIOH 5-1-17 1967.jpg, the specification drawing from the Army Institute of Heraldry. The official colors are part of the Standard Color...
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