I uploaded a color scan of Supplementary Exercises in Gregg Shorthand (1918) to the Internet Archive today. This book provides extra exercises for the 1916 Gregg Shorthand manual.
This is a color scan of an original copy with plates that are not faded. It is easy to read.
I have two black and white scans from the Internet. One was scanned from a copy with faded shorthand plates and is difficult to read. I don’t know where that one came from. The other scan is a more recent black and white Google Books scan. It is easy to read, but I prefer color scans of shorthand books.
Here is the link: