cover art for The Strangest Secret — by the artist Earl Nightingale. The cover art copyright is believed to belong to the label, Nightingale-McHugh Company, or the graphic artist(s).
Photo Credit: By May be found at the following website: https://www.youtube.com/watch?v=oeCdOQIKG74 https://www.youtube.com/watch?v=oeCdOQIKG74, Fair use, https://en.wikipedia.org/w/index.php?curid=64653787