re: Trouble in Aquila - a mystery solved?
That might not help much. Novae (as opposed to supernovae) are so numerous these days (due to better patrol methods) that they may not bother mapping them at all. Perhaps a specialized work like the new edition of the AAVSO Variable Star Atlas might have them. I have all the modern atlases, but it would still mean a lot of work to go through hundreds of maps to try to draw some statistical conclusions. Remember, Norton's was only 12 or 16 pages, as I recall.
This is the kind of work that is usually automated nowadays, using electronic versions of variable star catalogues.