You can uncheck some of the sources to reduce the amount of horizontal space needed (for example, I immediately took out the German ones, and then took out the

You can uncheck some of the sources to reduce the amount of horizontal space needed (for example, I immediately took out the German ones, and then took out the ones that appeared to have a lot of gaps, to the point where I'm down to "Mapping the Commodore 64", "Programmer's Reference Guide", and "64map"). But yeah, hopefully this becomes more of a starting point for a combined reference, since that seems to be more useful as an actual development resource than having to decide which source references to show side-by-side.