Vintage Underwood and Underwood Sporting Photograph Prints

Found this really cool scrapbook recently that contains dozens of Large Sports Photo Prints. These are all labeled on back by Underwood and Underwood they include description of athlete and photo. There are baseball boxing wrestling and others. From what I can find out these are from 1920s 30s. I'm hoping to find out more about them because I haven't found others like them yet. If you have information regarding please share.