Hi all,
Here’s something I’ve put together as part of my ongoing four-shape shape-note bibliographic work:
https://www.singloud.org/books/northern-harmony-1980/
It covers the printing history of Northern Harmony, including some surprising finds—like the strong possibility that the 1990 edition was possibly the first digital tunebook.
The bibliography isn't perfect, as I haven't seen a copy of the revised first edition, for example, but that's the advantage of publishing on a website.
If you spot anything amiss, or have additional info to share, I’d be very grateful for feedback.
Best,
Kevin