Recommended reading?

I am reading "The History of Gregg Shorthand", based on Mr. Gregg's writings, and edited by Mr. Leslie, published in 1964.  I'm thoroughly enjoying it.  I got it through interlibrary loan.

I'm interested in reading more.  Could you recommend what you've found useful and enjoyable?

Thanks very much.

(by Shorthand-learner for everyone)

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