The Gregg Group was founded 22 May 2004, prompted by the lack of online shorthand resources. As the primary use for shorthand — business and legal recording — has waned in recent decades, we generally acclaim the skill as a hobby or personal tool. The purpose of the group is to promote the use of Gregg systems of shorthand by providing advice to beginners, support for students, and an association of users of this efficient, attractive, and enjoyable method of writing.
The following Gregg Anniversary Shorthand books published in 1930 are now in the public domain in the United States:
-Gregg Shorthand Dictionary
-Gregg Shorthand Phrase Book
-Graded readings in Gregg Shorthand
-Teacher’s key for Graded Readings in Gregg Shorthand
There are a few other less important books that I have not listed above that are now in the public domain.
With the exception of the graded readings key, those books can be found on the Internet Archive.