For me, I collect NY Yankees, Ohio State football, and what I probably have the most of is University of Dayton basketball. I actually was in the middle of writing a book about the history of Dayton basketball when my first child was born. I now have two and the book is still not done
I did, however, get to interview the coach for Dayton back in the late 1930's (Jim Carter) last month.. He played running back at Purdue and turns 100 in November! His autograph still looks as good as it did 75 years ago!
