After renaming the photos so I could easily identify them, I went to Yardsellr and got one of the Spider Robinson books listed. It's a rare hardcover edition of Copyright Violation, 38 pages, leather-bound with a slipcase, one of 26 produced (lettered S on a back page) by Pulphouse Publishing, Eugene, Oregon.
I checked several websites, Abebooks.com for one, and saw it's going for $250. I also have two other copies, one bound in red leather and labeled "Red Staff" on a back page, and one of 300 with a dust jacket (No. 9). I'll get those listed very soon, along with the instruments..
Here's photos of the bowed psaltery (bought from Lark in the Morning when they had a store in Seattle near Pike Place) and the dulcimer: