I’ve started seeing some articles and videos etc noting this, looks like MLB are celebrating it this season. Thought I’d share a couple things I’ve found so far, feel free to add
A ‘Caught Listening’ podcast, interviewing the President of the Negro Leagues Museum in Kansas City
https://youtu.be/2KQv5pXFxe4
Some MLB videos with Howie Kendrick about Buck Leonard and other things
https://www.mlb.com/video/howard-discusses-buck-leonard (can use tags under that video to find more)