There is a map on this page from the site I posted in 2,760: http://members.tripod.com/~azrebel/page16.html
Is that the map you were thinking of?
I seem to remember a map calling both Arizona and New Mexico the New Mexico Territory. Must have been a Union map or pre-war map.
That is not the map I was thinking about, but it does show what I was talking about. The line was at 34 degrees north. The Missouri Compromise line was 36 degree 30 minutes north. I wonder was the basis of the claim was?
The Arizona Territory was formed in 1863.
Here is the 1860 Census map.