You could contact the St. Louis Genealogical Society -- someone there should be able to help you. They also sell books and maps: http://www.stlgs.org/mapsPhotos.htm

Also, if you go to www.worldcat.org, select advanced search, enter St. Louis as the subject, map as the format, 1850-1912 for the publication dates (have a little leeway) then you'll see what's available. Depending on the item, your library may be able to get it from another library via InterLibrary Loan.

Finally, this probably won't help much, but there's an 1883 map online: http://www.usgennet.org/usa/mo/county/stlouis/stlvicinity188...

Good luck with your searches!