June 19, 1957
Certificate with text: "This is to certify that Linus Carl Pauling has been designated Delegate to the sixteenth Congress of the International Union of Pure and Applied Chemistry to be held in Paris, France, from the eighteenth to the twenty-fourth of July, nineteen hundred and fifty-seven."
Presented by the National Academy of Sciences (U.S.). National Research Council.
Name: National Academy of Sciences (U.S.). National Research Council