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December 23, 1936. Washington, D.C. "Bureau of Standards. Standardization of card colors. Kenneth Kelley judging colors of dyes." Whatever you labor at, Shorpy wishes you a happy Labor Day. Harris & Ewing glass negative. View full size.
Kenneth Keith Kelley (1901–1991) was a twentieth century chemist who worked in the field of physical metallurgy. You can read more at http://resources.metapress.com/pdf-preview.axd?code=476620766608461j&siz...
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