I seem to remember a discussion here a while back about whether there was a “key” for the anniversary manual. I wasn’t sure at that time, but have recently found a copy.
It was copyrighted 1929, and is just a straightforward transcript of both the reading and writing materials–i.e., there is shorthand material as well as printed text.
At the front is the “Key to Chart of Brief Forms”, set up in table format, and in the back is the “Key to Chart of Most-Used Phrases”.
It’s a nice little booklet–probably worth keeping your eyes open for one in used bookstores and/or e-bay etc.