File:"Ridpath's History of the World" ad in Radio Age magazine (Jan-Dec 1924) (IA radioage03unse) (page 9 crop).jpg
![File:"Ridpath's History of the World" ad in Radio Age magazine (Jan-Dec 1924) (IA radioage03unse) (page 9 crop).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/9/92/%22Ridpath%27s_History_of_the_World%22_ad_in_Radio_Age_magazine_%28Jan-Dec_1924%29_%28IA_radioage03unse%29_%28page_9_crop%29.jpg/398px-%22Ridpath%27s_History_of_the_World%22_ad_in_Radio_Age_magazine_%28Jan-Dec_1924%29_%28IA_radioage03unse%29_%28page_9_crop%29.jpg?20211126063351)
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