Here's one of the most incredible Gehrig pieces I've seen, one of the very few letters in existence dating from after his July 4, 1939 farewell speech. The content is unbelievable. I'll let it speak for itself. It realized just over $31,000 in the May 2007 Heritage Auctions Signature auction.
http://sports.ha.com/common/view_ite...=19140&src=pr#