From a Gregg Writer magazine. Note the term "plates" was referred to the shorthand printed in the magazine that readers would copy and send into the Gregg Writer. Usually the OGA (Order of Greg Artists) sections.
"Gregg Shorthand had achieved the most extraordinary success ever attained by any system in the history of shorthand." John Robert Gregg, 1922
From a 1906 Gregg Writer suggested "A Vocabulary Test" in which obscure words from the dictionary of that time were used in this letter [personal note: please don't do this yourself... but it's fun and those who have a large vocabulary might enjoy this]: