http://www.selectric.org/selectric/
the above link has reference scans of IBM typewriter fonts from the 70s none of them I can find have the "th" for use in things like "11th" as is in this document: http://www.cbsnews.com/htdocs/pdf/BushGuardmay4.pdf
I am not sure if these scans are of the complete fonts. Any typewriter buffs no if you could get special characters on 1972 (and before) typewriters?
They are still all monospaced fonts - a word consisting of 6 upper case "W"s will be exactly the same length as a word consisting of 6 lower case "l"s. Not so with a proportionally spaced font, which slides the characters together based on their width. That is an excellent bit of research to find those reference scans.