Frequency of occurrence of letters in English

I’ve already posted the cake recipe from PopCo—a great novel by Alice Butler—so here another part of the back matter: a table of the frequency of occurrence of letters in English from Fletcher Pratt’s S_ecret and Urgent: the story of codes and ciphers_, Blue Ribbon Books, 1939. To be fair, the table above is actually from the only place I could find it on the internet: a 1997 patent for a chordic keyboard who cites “Pratt Fetcher”. Fletcher Pratt also established a dining club upon which Asimov’s Black Widowers series was based. Update: Apparently the numbers above are different than what was published in PopCo: