Another serendipitous find this morning ... if you see this post Tony (Rev Tony Newnham) send me a PM with an address and I will send this to you (not that I think you need it - will be nice to have with your collection of Harmoniums is what I mean)
It's not in bad condition ... all pages are still intact (57 pages) with some interesting exercises and music.
It certainly looks interesting. I was fortunate back in the '60's in knowing a couple of people who really knew how to play reed organs - but even so, I'm mainly self-taught on them.