I think I finally got all of the Saint Louis tapes in my collection up on the web. The focus is urban and top 40 from the mid-80s through the late 90s.
http://www.mostlyuppermidwestairchecks.com/st-louis-mo-airchecks.html
http://www.mostlyuppermidwestairchecks.com/st-louis-mo-airchecks.html