September 9, 2013 · 7:47 am
Elvis was 13 when he signed this book out in 1948. The card was recently auctioned for $7,500.00.
See article at the Chicago Pubic Library (via 22 Words)
Source:
http://schoollibrarybeyondsurvival.wordpress.com/2013/09/09/elvis-earliest-extant-signature-on-library-book-card/