I don’t doubt the provenance of the document or its assertions. However, we know that the Hawaii DoH used “caucasian” rather than “”white.” So the document is of little help, IMO, because we can establish that Hawaii didn’t conform to the document’s categorization of the most populous race in U.S.
I see that in the Nordyke long form BC. However, it’s a greater leap from “Negro” to being classified as “African” as a race back in 1961. They could have stuck with a more general classification using the old terms of Caucasoid, Negroid, Mongoloid, and Australoid.