Hey found an excellent book online. I don't know if its been mentioned on this site before. The whole book has been put on the following webpage
http://chestofbooks.com/languages/shorthand/Gregg-Speed-Practice/index.html
The website seems to host all kinds of free books online, but this is the only Gregg Shorthand one.
One of the most interesting sections is this one:
http://chestofbooks.com/languages/shorthand/Gregg-Speed-Practice/Speed-in-Shorthand.html
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