I'd say the Don Kelly book is the best one to start with the basic information (6th Edition form 2008 is the last one made).
Peter Huntoon also has a book titled "U.S. Large size National Notes" as well as another volume covering Territorial National Notes, if your's are older than the state and go back into the Territories era.
Maurice Burgett; Steven Whitfield wrote a pamphlet guide/reference book on Oklahoma Territorials in 1980.
My own goto guy for National Currency (not something I collect or deal in) is an old friend from my YN day at ANA
Summer Seminars 30+ years ago, he is a top National Currency Note dealer now - Bill Litthttps://www.williamlittcurrency.com/index.htm
He can probably answer any questions you have and get you prices on them as well.
There is always the https://www.spmc.org/
and the NNP has their journals up for reading and download, this might help you get started:https://archive.org/details/SPMCCityStatesIssuers
The main page under Library has journals and books available as well https://nnp.wustl.edu/
"Buy the Book Before You Buy the Coin" - Aaron R. Feldman - "And read it" - Me 2013! ANA
Life Member #3288 in good standing since 1982, EAC Member #6202, NBS Member, 2¢ variety collector.
See my want page: http://goccf.com/t/140440
Edited by westcoin
09/23/2021 2:29 pm