"Gregg Dictation and Transcription" Edition Inquiry

I came across this book titled "Gregg Dictation and Transcription by Renshaw and Leslie". Link here to access an online copy (note: you might have to download Adobe Digital Editions in order to borrow it from the online library). As I look through the forward I see no direct mention of what edition of the Gregg books it follows. Given the publication date of 1937 I imagine it is Anniversary Edition, but cannot be certain as I haven't had enough practice with it. Would anyone happen to know what edition this is intended for, has anyone had a chance to read this, if so did you find it useful? (I apologize if I posted in the wrong section.)

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