Where To Find Detailed Census Information for National Banknotes?
Auction houses will often list a banknote with a description saying something like "The only 1882 $5 Date Back reported from this bank" or "The highest grade 1929 Type 1 $10 for this bank." Where do they get this kind of detailed census information?
I have the sixth edition of Don C. Kelly's "National Bank Notes" book, but it gives only high level "5 large 16 small" type census information.
The PMG Population Report is interesting, but it appears to not be broken down by individual banks.
I'm aware of the National Bank Note Census (NBNC) web site, but they want $100/yr for access, and I'd hate to spend the money if it won't give me what I want.
I'm also aware of the National Bank Note Census web site through the Society of Paper Money Collectors (SPMC), but they want $20/year and, again, I'd hate to spend the money if it won't give me what I want.
So, what do YOU use for detailed census information on national banknotes?