"Kleine Sammlung..."
It was a small collection at first. It's growing.
The version Rob posted is from 2017 and has 500 pages. I just looked at the oldest version I have on my current computer, version 3.35 from 2011. It has 307 pages. Someday maybe we'll see a future edition with diagrams for Rob's Brooks Basses.
He also has a directory of different Telecaster wiring schemes, and a fan site about the Brother Cadfael novels.