Yuyo Ruiz, mentioned above, brought the babe Ruth signed ball to a card show in Miami and I was lucky enough to see it up close. Yuyo wrote a booklet about the ball and Babe's visit. Also Gary Ashwill over at Agate Type has a couple of articles on the Babe's visit to Cuba including his passport application:
https://agatetype.typepad.com/agate_...uths-pass.html