I'm in New Mexico, but here are a couple of ideas.
My local library had a few. Ask the reference librarian.
I made an appointment with the historian at a local museum and took a lot of notes (too cheap to pay the $40/hour they wanted for making copies!)
The Library of Congress has some online
HERE . They were going to digitize them all, but the company that bought the Sanborns got greedy.
Speaking of whom, I'm sure you've seen
THEIR SITE...(Historic Map Works)
Some Universities have collections, unfortunately the NM ones are up in Albuquerque, about 4 hours north of me, but you may have better luck.
Hope it helps!
William in Sunny SW New Mexico
Garrett AT Gold & AT Pro, Garrett Pro-Pointers, Lesche & Fiskar's Diggers, Garmin Oregon 450 GPS, ASUS Tablet (Great Topos!)
To paraphrase Thomas Jefferson: I believe in luck, and the more I dig, the luckier I get.
note to self: It's only a hobby, It's only a hobby, It's only a ....
