The larger font will be used in most future texts. Works created from 1923 through 1963 were subject to a number of deadlines for registration renewal. If the renewal was made, there is a possibility that it is still a validly copyrighted work, due to extensions which could create a 95-year copyright term. If the renewal was not made, the copyright term expired 28 years after the work was copyrighted. Works created from 1964 onwards have a 95-year copyright term.
Documents published outside the U.S. by non-U.S. citizens are a slightly different matter.
The Berne Treaty set a copyright expiration of 50 years after the author's death.