I found a publication of

Drawing on the Power of the Word
This book seeks to enhance the power of expression and explore the moral implications of speech and action. It consists of twenty readings, each of which is complemented by exercises in language skills. The readings begin simply, but gain in complexity both in terms of thought and language. The first reading introduces Diego and his youth group, who live in the small town of Alegrías. With the help of a tutor from the nearby institute named Elisa, the group thinks about the power of enlightened words and pure deeds to bring about social change. The book is designed for youth aged 14.
Author: The Ruhi Foundation Price: $5.00 the Ruhi Institute not included in the regular nine normally listed.

I find the title of this book very interesting as it reminds me of one of Baha'u'llah's Prayers. I believe our words must have depth to them in order that they make the inner core of the listener vibrate if they are to influence those people. I don't know if it is included in the series. I hope to purchase this book. My instincts say this book should be a prerequisite for all Ruhi endeavors.