27 minutes of many audio clips and legal ID's posted by a gentleman on another board from May and June 1973. The first three minutes are WLS, then lots more stations featured after that.

https://app.box.com/s/0vh7v8ln7o8qtelqw55f?fbclid=IwAR1k9FX8OlmLo-Zw84JtKGMMhZfghG_GhuHSogvpyyIzTXHlDHKDKSmLFcE