Comparing the memos available on the CBS News website, one finds the author used the superscript "th" in some, and did not use this special key in another.
That key is a single-stroke special character.
It's the smoking gun to this latest bit of phoney-baloney from an overeager media seeking to prop up another leftie.
Actually, this is a reason why I had NOT been convinced that the documents were fake. I remember using IBM Selectric's with the "type balls" in the early '70s. Different type balls had different single stroke special characters. One of the keys on the typewriter would type various different characters depending upon which type ball you had inserted.
I don't specifically recall whether there was a type ball with a superscript "th" character, but I do remember balls with "1/2", "1/4", ©, ®, ™, and other special characters so there could very well have been ones with a single stroke superscript "th" character. If someone were using a typewriter with a "th" character they might very well forget to use it sometimes and type "th" instead.
However, the document overlay posted by Blood of Tyrants has me convinced. There is no question that the font on the "May 1972" document is identical to the font on the document that was just created by Blood of Tyrants.