This site is "deep." The navigation bar at the left is just the beginning. For example, the "Time Line" gives access to hundreds of articles. Use the Search Box at the bottom of each page to help locate specific topics.
May 10, 1938 - Look Magazine - Ray L. Doan Baseball School
1938 Article from an ad on eBay.
1938 ad for Doan School listing Kid Elberfeld taking from eBay listing in March, 2016