http://www.communityvoiceks.com/news...2bd759c62.html
"Humboldt set up a local baseball Hall of Fame with a display featuring photos, articles and memorabilia associated with the both Sweatt and Johnson.* Town teams play at both Walter Johnson Field (baseball and football) and at Sweatt Field (baseball), and monuments to both men stand at various locations throughout town."
Above quote is last paragraph of article at the link above. Perhaps contacting Humboldt, Kansas would be of help.