We have a map library which has topo maps galore.  Try your nearest
geology or geography department at a local college or university or
perhaps a high school geography or science teacher could help you.
 
If you would like to send me a large self-addressed stamped envelope,
I would be happy to locate two or three older maps for you.
 
Connie Fairchild
Dept. of Geology
Western Illinois University
Macomb, IL   61455              Internet:  [log in to unmask]